What if Geoffrey had not died in 1186 and gained Anjou as he wanted to, and if Philip had not survived his bout of fever in 1191?
Here's a possible start:
1186 - Geoffrey allies with Philip against his father. Like the preceding ones, the rebellion isn’t a success and Philip is defeated; Geoffrey is forgiven and eventually gains Anjou, as he wanted.
1186/1189 - Geoffrey remains on good terms with his father.
1189 - Richard’s rebellion. Geoffrey carefully keeps away and John joins Richard as in OTL. Death of Henry II.
1190 - Richard and Philip go on Crusade.
1191 - Philip falls ill and dies.
Butterflies: French regency and John's reaction to Richard’s capture.
French regency. Logically, Adela of Champagne remains regent, but the Hainaut family is likely to start meddling and Henry II of Champagne might come back to help his aunt, so who would marry Isabelle of Jerusalem?
And John could have his marriage to Isabella of Gloucester annulled and marry Alys of France to claim the regency (and strengthen his position compared to Richard and Geoffrey)
After Richard’s capture. Would John still try to seize the throne given that Geoffrey isn’t dead? He could take a leaf from Henry I’s book, hurrying to seize the royal treasury despite his elder brother being alive.
Here's a possible start:
1186 - Geoffrey allies with Philip against his father. Like the preceding ones, the rebellion isn’t a success and Philip is defeated; Geoffrey is forgiven and eventually gains Anjou, as he wanted.
1186/1189 - Geoffrey remains on good terms with his father.
1189 - Richard’s rebellion. Geoffrey carefully keeps away and John joins Richard as in OTL. Death of Henry II.
1190 - Richard and Philip go on Crusade.
1191 - Philip falls ill and dies.
Butterflies: French regency and John's reaction to Richard’s capture.
French regency. Logically, Adela of Champagne remains regent, but the Hainaut family is likely to start meddling and Henry II of Champagne might come back to help his aunt, so who would marry Isabelle of Jerusalem?
And John could have his marriage to Isabella of Gloucester annulled and marry Alys of France to claim the regency (and strengthen his position compared to Richard and Geoffrey)
After Richard’s capture. Would John still try to seize the throne given that Geoffrey isn’t dead? He could take a leaf from Henry I’s book, hurrying to seize the royal treasury despite his elder brother being alive.