WI: King Henry I of Castile lives?

IOTL, King Henry I of Castile, the youngest surviving son of Alfonso VIII and Eleanor of England, died in 1217 when he was struck by a falling roof tile. His death led to the succession of his sister Berengaria who then abdicated in favour of her son, Ferdinand, the heir of Leon. Then, when Alfonso IX died in 1230, the two crowns were united for the first time since 1157.

Aside from the obvious continued separation of the crowns, how would history be different if the boy king had survived? Henry was only 13 at his death. First, I imagine he might marry Elisabeth of Swabia instead of Ferdinand. A delayed Reconquista?
 
IOTL, King Henry I of Castile, the youngest surviving son of Alfonso VIII and Eleanor of England, died in 1217 when he was struck by a falling roof tile. His death led to the succession of his sister Berengaria who then abdicated in favour of her son, Ferdinand, the heir of Leon. Then, when Alfonso IX died in 1230, the two crowns were united for the first time since 1157.

Aside from the obvious continued separation of the crowns, how would history be different if the boy king had survived? Henry was only 13 at his death. First, I imagine he might marry Elisabeth of Swabia instead of Ferdinand. A delayed Reconquista?

He is betrothed to Sanchia of Leon before his death, so this marriage would push through.
 
He is betrothed to Sanchia of Leon before his death, so this marriage would push through.

But how long before it's annulled on grounds of consanguinity? Henry's last marriage to Mafalda of Portugal was annulled because of that, and he and Sancha are even more closely-related.

Sancha was also the daughter of Alfonso IX's first wife Teresa of Portugal. If she doesn't become Queen of Castile, Berengaria, Henry's sister, is going to want to advance the power of her own sons and daughters as much as possible in Leon.

Who do you think HRE Frederick II is going to want to ally with more - Castile or Leon?
 
But how long before it's annulled on grounds of consanguinity? Henry's last marriage to Mafalda of Portugal was annulled because of that, and he and Sancha are even more closely-related.

Sancha was also the daughter of Alfonso IX's first wife Teresa of Portugal. If she doesn't become Queen of Castile, Berengaria, Henry's sister, is going to want to advance the power of her own sons and daughters as much as possible in Leon.

Who do you think HRE Frederick II is going to want to ally with more - Castile or Leon?

Teresa also has a son actually, who is the heir to Leon but he died prematurely, I think it is best if Conrad of Swabia never died and married Berengaria, I think the other possible bride for Alfonso IX would be Eleanor of Brittany or Richeza of Saxony, they don't have the same consanguinity problem.
 
Teresa also has a son actually, who is the heir to Leon but he died prematurely, I think it is best if Conrad of Swabia never died and married Berengaria, I think the other possible bride for Alfonso IX would be Eleanor of Brittany or Richeza of Saxony, they don't have the same consanguinity problem.

Alfonso had remarried to Teresa by 1217, so it doesn't make much difference.

Getting back on topic, how well could Henry I of Castile do in comparison to another Iberian king orphaned at a young age - James the Conqueror of Aragon? James faced several noble rebellions from 1221 to 1228, while Henry's 3 year reign seems to have been peaceful, perhaps in part due to the success of his father.

I could see central Spain being split down the middle between Castile and Leon, or Castile clashing with Leon over Cordoba and with Aragon over Murcia.
 
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