Moses ben Nachman, commonly known as Nachmanides, and also referred to by the acronym Ramban and by the contemporary nickname Bonastruc ça Porta, was a leading medieval Jewish scholar, Spanish rabbi, philosopher, physician, kabbalist, and biblical commentator. He was raised, studied, and lived for most of his life in Girona, Catalonia. He is also considered to be an important figure in the re-establishment of the Jewish community in Jerusalem following its destruction by the Crusaders in 1099.