The House of Aragon was a royal dynasty that originated in the Kingdom of Aragon, located in northeastern Spain. It played a significant role in the history of Spain and Europe from the 11th century until the early 18th century. The house is known for its influential monarchs, including Ferdinand II of Aragon and Isabella I of Castile, who united their kingdoms through marriage, leading to the formation of modern Spain. The House of Aragon expanded its influence through strategic marriages and conquests, establishing territories in Sicily, Sardinia, and Naples. It was also involved in the Crusades and played a crucial role in the Mediterranean politics of the time. The dynasty eventually merged with the House of Bourbon in the early 18th century, marking the end of its independent rule.