The Disputation of Barcelona (July 20-24, 1263) was a formal ordered medieval debate between representatives of Christianity and Judaism regarding whether or not Jesus was the Messiah. It was held at the royal palace of King James I of Aragon in the presence of the King, his court, and many prominent ecclesiastical dignitaries and knights, between Dominican Friar Pablo Christiani, a convert from Judaism to Christianity, and Rabbi Nahmanides (Moshe Ben Nachman, Ramban), a leading medieval Jewish scholar, philosopher, physician, kabbalist, and biblical commentator.

During the...