Ferrand Martínez
Ferrand Martínez (fl. late 14th century) was a cleric of Seville cathedral and archdeacon of Écija. For years he preached against the Jews of Castile, and historians regard him as the prime mover of the 1391 massacres, which began in Seville and spread across the Iberian kingdoms.
The royal government imprisoned him in 1395. He was soon released, died shortly afterwards, and left his fortune to a hospital he had founded in Seville.