The marriage of King John of England to Isabella of Angoulême took place in Angoulême Cathedral, a significant event marking the consolidation of power and alliances in the realm. Isabella was the daughter of Count Aimery of Angoulême, which made the union politically strategic. King John's previous betrothal to another noblewoman added complexity to this union; however, he nullified that engagement to pursue Isabella. The wedding ceremony, steeped in the traditions and pomp of the medieval period, captured the interests of nobility from both England and France.

Isabella was only around twelve years old at the time of their marriage, which was not uncommon in medieval times. The match is notable not just for its political implications, but also for the dynamics within John’s royal court and among the Anglo-French nobility. King John's reign was already marked by challenges, and this marriage sought to fortify his position against internal dissent and external threats, particularly from France.

Following the wedding, King John faced various challenges, including rebellion from his barons and issues surrounding his attempt to reclaim lost territories in France. The marriage to Isabella was intertwined with these efforts, reflecting the delicate balance of maintaining power and securing political leverage through marital alliances. The union produced several children, including future English monarchs, thereby impacting the lineage of the English crown.