 He made a pilgrimage to Santiago de Compostela in March 1224 . According to the Latin Chronicle of the Kings of Castile , John went to the Kingdom of León to marry one of the elder daughters of Alfonso IX of León ( Sancha or Dulce ) because Alfonso had promised him the kingdom " along with her " . The marriage could jeopardize the claim of Sancha 's and Dulce 's half @-@ brother , Ferdinand III of Castile , to León . To protect her son 's interests , Ferdinand 's mother Berengaria of Castile decided to give her daughter ( Berengaria of León ) to John in marriage . Although modern historians do not unanimously accept the chronicle 's account of John 's plan to marry Sancha or Dulce , they agree that the queen of France ( Blanche of Castile , Berengaria of Castile 's sister ) played an important role in convincing John to marry her niece . The marriage of John and Berengaria of León was celebrated in Burgos in May 1224 . 
 He made a pilgrimage to Santiago de Compostela in March 1224 . According to the Latin Chronicle of the Kings of Castile , John went to the Kingdom of León to marry one of the elder daughters of Alfonso IX of León ( Sancha or Dulce ) because Alfonso <a href='been_done' title='1'><mark>had</mark></a> promised him the kingdom " along with her " . The marriage could jeopardize the claim of Sancha <a href='null_genetive' title='2'><mark>'s</mark></a>and Dulce <a href='null_genetive' title='3'><mark>'s</mark></a>half @-@ brother , Ferdinand III of Castile , to León . To protect her son <a href='null_genetive' title='4'><mark>'s</mark></a>interests , Ferdinand <a href='null_genetive' title='5'><mark>'s</mark></a>mother Berengaria of Castile decided to give her daughter ( Berengaria of León ) to John in marriage . Although modern historians do not unanimously accept the chronicle <a href='null_genetive' title='6'><mark>'s</mark></a>account of John <a href='null_genetive' title='7'><mark>'s</mark></a>plan to marry Sancha or Dulce , they agree that the queen of France ( Blanche of Castile , Berengaria of Castile <a href='null_genetive' title='8'><mark>'s</mark></a>sister ) played an important role in convincing John to marry her niece . The marriage of John and Berengaria of León was celebrated in Burgos in May 1224 . 
He made a pilgrimage to Santiago de Compostela in March 1224 . According to the Latin Chronicle of the Kings of Castile , John went to da Kingdom of León to marry one of the elder daughters of Alfonso IX of León ( Sancha or Dulce ) because Alfonso done promised him the kingdom " along w her " . The marriage could jeopardize the claim of Sancha  and Dulce  half @-@ homeboy , Ferdinand III of Castile , to León . To protect her son  interests , Ferdinand  mother Berengaria of Castile decided to give her daughter ( Berengaria of León ) to John in marriage . Although modern historians do not unanimously accept the chronicle  account of John  plan to marry Sancha or Dulce , they agree dat the queen of France ( Blanche of Castile , Berengaria of Castile  sister ) played an important role in convincing John to marry her niece . The marriage of John and Berengaria of León was celebrated in Burgos in May 1224 .