Juan Carlos was married in Athens at the Church of Saint Dennis on May 14th, 1962, to Princess Sophia of Greece and Denmark, daughter of King Paul. She was Greek Orthodox but converted to Roman Catholicism in order to become Spain's queen. Her name is now styled as Queen Sofia.
Juan Carlos and Sofia are fluent in several languages. They both speak Spanish, English, and French. The king also speaks fluent Italian and Catalan. Unlike the queen, Juan Carlos does not speak any German, nor her native language, Greek, a fact he allegedly regrets.