Matilda's younger brother, William Adelin, died in the "White Ship" disaster of 1120, leaving Matilda's father and realm facing a potential succession crisis. On Emperor Henry V's death, Matilda was recalled to Normandy by her father, who arranged for her to marry Geoffrey of Anjou to form an alliance to protect his southern borders. Henry I had no further legitimate children and nominated Matilda as his heir, making his court swear an oath of loyalty to her and her successors, but the decision was not popular in the Anglo-Norman court. Henry died in 1135, but Matilda and Geoffrey faced opposition from Anglo-Norman barons. The throne was instead taken by Matilda's cousin Stephen of Blois, who enjoyed the backing of the English Church. Stephen took steps to solidify his new regime but faced threats both from neighbouring powers and from opponents within his kingdom.