Hasdai Crescas

Hasdai Crescas (c. 1340–1410/11) was a Jewish philosopher and legal scholar born in Barcelona who later served as crown rabbi of Aragon. His major work, Or Adonai (Light of the Lord), challenged the Aristotelian logic that dominated Jewish theology, arguing that faith and God's will could not be reduced to it.

His only son was killed in the massacre of 1391, after which he wrote his most famous works. His critique of Aristotle later shaped the thought of Baruch Spinoza.