In 1156, Henry II of England and Eleanor of Aquitaine's son William survives. All children outlive Henry.

Henry and Eleanor's succession:
- William III, King of England, Duke of Normandy, Count of Anjou, Maine and Touraine
- Henry, Duke of Aquitaine
- Richard, Duke of Brittany jure uxoris
- Geoffrey, Lord of Ireland
- John, Archbishop of York

It's impossible to know whether William will do well as King or not but...
How could things go in Aquitaine with Henry as duke?
How would the Duchy of Brittany evolve under Richard's rule?
Would Geoffrey do better than John in Ireland?
 
Plantagenet family tree
Henry II Plantagenet (1133-1189) m. Eleanor of Aquitaine (1124-1204)
  1. William III of England (1153-1210) m. Margaret of France (1158-1215)
    1. Henry of England (1175-1199)
    2. Eleanor of England (1177-1215)
    3. Margaret of England (1180-1236)
    4. Henry III of England (1182-1234)
    5. William of England (1185)
  2. Henry I of Aquitaine (1155-1193) m. Alys of France (1160-1200)
    1. William of Aquitaine (1179)
    2. Alys of Aquitaine (1180-1231), abbess of Fontevraud
    3. Henry of Aquitaine (1183-1198)
    4. Eleanor of Aquitaine (1185-1191)
  3. Matilda of England (1156-1191) m. Henry the Lion, Duke of Saxony and Bavaria (c.1130-1195)
    1. Richenza-Matilda of Saxony (1172–1204)
    2. Henry V, Count Palatine of the Rhine (1173–1227)
    3. Lothar of Bavaria (1174–1190)
    4. Otto IV, Holy Roman Emperor and Duke of Swabia (1175–1218)
    5. William of Winchester, Lord of Lüneburg (1184–1213)
  4. Richard I of Brittany (1157-1215) m. Constance of Brittany (1161-1219)
    1. Eleanor of Brittany (1182-1237)
    2. Matilda of Brittany (1184-1226)
    3. Richard II of Brittany (1187-1248)
    4. Constance of Brittany (1189-1234)
    5. Henry of Brittany (1192-1194)
    6. Geoffrey of Brittany (1193-1254)
    7. Joan of Brittany (1196-1254)
    8. William of Brittany (1196-1242)
  5. Geoffrey I, Lord of Ireland (1158-1212) m. Berengaria of Navarre (c.1168-1230)
    1. Henry I, Lord of Ireland (1183-1243)
    2. Berengaria of Ireland (1185-1227)
    3. Eleanor of Ireland (1188-1237)
    4. Geoffrey of Ireland (1191-1252)
  6. Eleanor of England (1162-1214) m. Alfonso VIII of Castile (1155-1214)
    1. Berengaria of Castile (1180-1246)
    2. Sancho of Castile (1181)
    3. Sancha of Castile (1182-1185)
    4. Henry of Castile (1182-1184)
    5. Ferdinand of Castile (1184)
    6. Urraca of Castile (b.1187)
    7. Blanche of Castile (b.1188)
    8. Ferdinand of Castile (1189-1211)
    9. Mafalda of Castile (1191-1211)
    10. Eleanor of Castile (b.1200)
    11. Constance of Castile (1202-1243)
    12. Henry I of Castile (1204-1217)
  7. Joan of England (1165-1199) m. a) William II of Sicily (1153-1189), b) Raymond VI of Toulouse (1156-1222)
    1. a) Bohemond of Sicily (1181)
    2. b) Raymond VII of Toulouse (b.1197)
    3. b) Joan of Toulouse (b.1198)
    4. b) Richard of Toulouse (1199)
  8. John, Archbishop of York
    1. several illegitmate children
 
In 1156, Henry II of England and Eleanor of Aquitaine's son William survives. All children outlive Henry.

Henry and Eleanor's succession:
- William III, King of England, Duke of Normandy, Count of Anjou, Maine and Touraine
- Henry, Duke of Aquitaine
- Richard, Duke of Brittany jure uxoris
- Geoffrey, Lord of Ireland
- John, Archbishop of York

It's impossible to know whether William will do well as King or not but...
How could things go in Aquitaine with Henry as duke?
How would the Duchy of Brittany evolve under Richard's rule?
Would Geoffrey do better than John in Ireland?
My biggest trouble about it is who I can not see Richard as Duke of Brittany...
maybe he was once engaged to Constance but she will most likely end married to Geoffrey while Richard end in Jerusalem as King Consort of Sibylla (either as first or second husband)
 
My biggest trouble about it is who I can not see Richard as Duke of Brittany...
maybe he was once engaged to Constance but she will most likely end married to Geoffrey while Richard end in Jerusalem as King Consort of Sibylla (either as first or second husband)
It would be interesting. Acutally, I made Richard marry Constance only because he'd be the third son ITTL and it was the third son (Geoffrey) who married her OTL.
Anyway, I don't think Richard would settle for the Duchy of Brittany ITTL, he'd probably take advantage of his superiority over Henry to get Aquitaine as well.

And I think Geoffrey would do better than John in Ireland.
 
It would be interesting. Acutally, I made Richard marry Constance only because he'd be the third son ITTL and it was the third son (Geoffrey) who married her OTL.
Anyway, I don't think Richard would settle for the Duchy of Brittany ITTL, he'd probably take advantage of his superiority over Henry to get Aquitaine as well.

And I think Geoffrey would do better than John in Ireland.
Yes, but I think who said third son with his character and warlike attitude would be likely to search fortune in a Jerusalem or sent there by his father for get rid of him and with Richard as husband of Sibylla and King of Jerusalem is pretty unlikely who Saladin will be able to take the city and destroying the kingdom of the Crusaders and instead maybe we can have the Kingdom of Jerusalem conquering Egypt, reinforcing their lands...
 
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Yes, but I think who said third son with his character and warlike attitude would be likely to search fortune in a Jerusalem or sent there by his father for get rid of him and with Richard as husband of Sibylla and King of Jerusalem is pretty unlikely who Saladin will be able to take the city and destroying the kingdom of the Crusaders and instead maybe we can have the Kingdom of Jerusalem conquering Egypt, reinforcing their lands...
Then, Richard'll probably be Isabella's first husband.

If Geoffrey has already been made Lord of Ireland when Henry decides to send Richard away to the Holy Land, he'll end up both Lord of Ireland and Duke of Brittany jure uxoris. In this case, the 1183 revolt would be different: Henry rebels against his father because he still feels Henry II has not given enough power in Aquitaine but Geoffrey doesn't take part to the revolt, even if Henry hasn't given him and Constance the Earldom of Richmond and the County of Nantes back yet. I can imagine him being faithful to his father and turning against his brother.
Would Henry still die in 1183 ITTL? I don't know. If he does, what will happen to Aquitaine? Will Henry II call back Richard (unlikely) or give it to William or Geoffrey? John is probably ruled out here, as he'll have already taken holy vows.
 
Updated Plantagenet family tree
Henry II Plantagenet (1133-1189) m. Eleanor of Aquitaine (1124-1204)
  1. William III of England (1153-1210) m. Margaret of France (1158-1215)
    1. Henry of England (1175-1199)
    2. Eleanor of England (1177-1215)
    3. Margaret of England (1180-1236)
    4. Henry III of England (1182-1234)
    5. William of England (1185)
  2. Henry I of Aquitaine (1155-1183) m. Alys of France (1160-1200)
    1. William of Aquitaine (1179)
    2. Alys of Aquitaine (1180-1231), abbess of Fontevraud
    3. Henry II of Aquitaine (1183-1198)
  3. Matilda of England (1156-1191) m. Henry the Lion, Duke of Saxony and Bavaria (c.1130-1195)
    1. Richenza-Matilda of Saxony (1172–1204)
    2. Henry V, Count Palatine of the Rhine (1173–1227)
    3. Lothar of Bavaria (1174–1190)
    4. Otto IV, Holy Roman Emperor and Duke of Swabia (1175–1218)
    5. William of Winchester, Lord of Lüneburg (1184–1213)
  4. Richard I of Jerusalem (1157-1215) b. Constance of Brittany (1161-1219), m. Sybilla of Jerusalem (1160-1190)
    1. Richard II of Jersualem (1187-1248)
    2. Sybilla of Jerusalem (1189-1234)
    3. Eleanor of Jersualem (1190-1194)
  5. Geoffrey I, Lord of Ireland, Duke of Brittany (as Geoffrey II) and Count of Poitiers (1158-1212) m. Constance of Brittany (1161-1219)
    1. Eleanor of Brittany (1182-1237)
    2. Matilda of Brittany (1184-1226)
    3. Arthur I, Duke of Brittany and Lord of Ireland (1187-1248)
    4. Constance of Brittany (1189-1234)
    5. Henry of Brittany (1192-1194)
    6. Geoffrey of Brittany (1193-1254)
    7. Joan of Brittany (1196-1254)
    8. William of Brittany (1196-1242)
  6. Eleanor of England (1162-1214) m. Alfonso VIII of Castile (1155-1214)
    1. Berengaria of Castile (1180-1246)
    2. Sancho of Castile (1181)
    3. Sancha of Castile (1182-1185)
    4. Henry of Castile (1182-1184)
    5. Ferdinand of Castile (1184)
    6. Urraca of Castile (b.1187)
    7. Blanche of Castile (b.1188)
    8. Ferdinand of Castile (1189-1211)
    9. Mafalda of Castile (1191-1211)
    10. Eleanor of Castile (b.1200)
    11. Constance of Castile (1202-1243)
    12. Henry I of Castile (1204-1217)
  7. Joan of England (1165-1199) m. a) William II of Sicily (1153-1189), b) Raymond VI of Toulouse (1156-1222)
    1. a) Bohemond of Sicily (1181)
    2. b) Raymond VII of Toulouse (b.1197)
    3. b) Joan of Toulouse (b.1198)
    4. b) Richard of Toulouse (1199)
  8. John, Archbishop of York
    1. several illegitmate children
 
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W
Then, Richard'll probably be Isabella's first husband.

If Geoffrey has already been made Lord of Ireland when Henry decides to send Richard away to the Holy Land, he'll end up both Lord of Ireland and Duke of Brittany jure uxoris. In this case, the 1183 revolt would be different: Henry rebels against his father because he still feels Henry II has not given enough power in Aquitaine but Geoffrey doesn't take part to the revolt, even if Henry hasn't given him and Constance the Earldom of Richmond and the County of Nantes back yet. I can imagine him being faithful to his father and turning against his brother.
Would Henry still die in 1183 ITTL? I don't know. If he does, what will happen to Aquitaine? Will Henry II call back Richard (unlikely) or give it to William or Geoffrey? John is probably ruled out here, as he'll have already taken holy vows.

Why Isabella and not Sibylla? Richard will most likely end in Jerusalem between 1174 and 1177 at the latest (as we need to prevent his wedding to Constance) so in time for becoming Sibylla’s second husband if not the first. Isabella is way too young for him plus a wedding to her would be possible only after the fall of Jerusalem.

If Henry die in 1183 well Aquitaine will either go to his children or back to his mother (who will select a new heir, likely among her grandsons).
The rebellion of 1183 do not need to happen here if William and Henry had already lands of their own to rule and Geoffrey has both Ireland and Britain (in any case Geoffrey’s engagement to Berengaria is pretty unlikely as Navarre would not be an interesting alliance for him and she would still be less than 10 years old at the latest date of Richard’s departure to Jerusalem).
Take away Richard and John (who was one of the main cause of the OTL rebellion) and Henry will find a compromise with his sons
 
Why Isabella and not Sibylla? Richard will most likely end in Jerusalem between 1174 and 1177 at the latest (as we need to prevent his wedding to Constance) so in time for becoming Sibylla’s second husband if not the first. Isabella is way too young for him plus a wedding to her would be possible only after the fall of Jerusalem.
True, I didn't even think about Sybilla. So Richard would be her second husband, I think. I'll edit my previous post then.

If Henry die in 1183 well Aquitaine will either go to his children or back to his mother (who will select a new heir, likely among her grandsons).
The rebellion of 1183 do not need to happen here if William and Henry had already lands of their own to rule and Geoffrey has both Ireland and Britain (in any case Geoffrey’s engagement to Berengaria is pretty unlikely as Navarre would not be an interesting alliance for him and she would still be less than 10 years old at the latest date of Richard’s departure to Jerusalem).
Take away Richard and John (who was one of the main cause of the OTL rebellion) and Henry will find a compromise with his sons
Yes, I think Eleanor will choose one Henry's children. The question is will their uncles leave them alone or will one of them try to grab wealthy Aquitaine?
 
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1174-1189
In 1174, Richard was the last of Henry’s sons to surrender, as he wanted more than the Duchy of Brittany. Henry II eventually defeated him. He broke up Richard and Constance’s betrothal and sent Richard to the Holy Land to go on pilgrimage and do penance.
After Richard sailed away, Henry betrothed Constance to Geoffrey.

In the Holy Land, Richard was welcomed by his cousin Bohemond III of Antioch and was later betrothed to one of Humphrey II of Toron’s daughters but the marriage would never be celebrated as the Church would not grant them the needed dispensation. In 1180, however, he married Sibylla of Jersualem, widow of William of Montferrat.

In 1181, Geoffrey and Constance of Brittany married but Henry II kept the Earldom of Richmond and the County of Nantes. The next year, Henry, feeling his father should let him rule Aquitaine, rebelled again. Henry II and William retaliated and Geoffrey joined them, seizing several strategic castles in Poitou. In June 1183, Henry contracted dysentry and died. His newborn and namesake son Henry became Duke of Aquitaine. He and his sister Alys were brought up in his grandfather’s household and their mother, Alys of France, who was suspected of having played a part in Henry’s rebellion, was imprisoned.

Geoffrey was allowed to keep the castles he had seized in Poitou, to William’s great displeasure. In the following years, Henry returned Richmond and Nantes to Constance and Geoffrey. In 1189, the French king launched an expedition against Henry II and William, by now tired of waiting for his father to include him in the government of the Kingdom, joined him. Geoffrey supported his father and invaded Poitou. Henry died on 6 July 1189 and William succeeded him but had lost Poitou to Geoffrey.
 
1189-1192
When William became King of England, he kept Eleanor imprisoned in order to keep Aquitaine under control. Meanwhile in the Holy Land, things were getting tense for Christians, due to Raynald de Châtillon’s treachery. The new King of Jerusalem, Richard Lionheart, had managed to keep the Saracens at bay but Pope Urban III was worried about the fate of the city and convinced several sovereigns to take the Cross. Henry II of England had been one of them, but he had died before he could fulfil his promise and William III reluctantly agreed to go. He appointed his wife Margaret of France regent and exacted an oath of allegiance from his brother Geoffrey as Duke of Brittany and Count of Poitiers. Constance bristled when she heard the news but she knew William would rather stay in his kingdom and be called a coward rather than go on Crusade and leave his brother behind, and so she let her husband swear allegiance to the King.

William and Philp left France together for Sicily, where they heard that William’s sister, Joan, had been imprisoned by her late husband’s bastard cousin Tancred, who had seized the throne. William freed Joan and managed to come to terms with Tancred. Then he sailed away, taking his sister with him.
Upon their arrival, William and Joan were met by King Richard. Things might have been settled quickly but William and Richard’s relationship were strained, the first being jealous of his younger brother’s success and the second feeling outraged that the Pope thought he could not deal with the situation on his own and called for help in his name.

Philip of France, who had been taken seriously ill soon after his arrival, had been thinking of going back to France. He was too happy to see dissent grow between the two brothers however, and found his health was getting better and decided to stay. He did his best to make things worse, and he succeeded. As a result, the Crusade dragged on and William became notorious for his lack of common sense, which resulted in several humiliating defeats for the Crusaders’ army.
Richard tried to calm things down and offered to marry Joan to Saladin’s brother, only to be flatly refused. In May 1192 however, Philippe, who had become sick again, left for France. Richard eventually managed to reconcile with William and defeated Saladin, who made peace.

William, feeling he was not needed any more, sailed back to Aquitaine, where he was met with unpleasant news…

Soon after William’s departure, Constance had claimed that she, the rightful heiress of Brittany, had not sworn allegiance to the King, and she and Geoffrey had accordingly marched into Normandy. There, Geoffrey had freed his mother, Queen Eleanor, who was acknowledged as Duchess of Aquitaine in her own right and took her grandchildren, little Henry and Alys, with her. Geoffrey then swore allegiance to her for the County of Poitiers. He also freed his sister-in-law Alys of France and married her to Guillaume de Rohan, much to Philippe’s horror when he came back from the Crusade to find his sister married to a mere viscount’s younger brother.

When William finally came back, Aquitaine seemed lost for good and his estates were threatened by Philippe, who had taken advantage of Eleanor’s release to convince his sister Margaret to make an alliance with him.
William had to acknowledge his mother as the rightful Duchess of Aquitaine and embarked on a long war to regain control of his own lands.
 
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