Such and Such as a way of mocking the deposed Bohemund VI.
This man sent a letter describing the horrors he visited upon Antioch addressed to Count Such and Such as a way of mocking the deposed Bohemund VI. He established the Al-Zahiriyah Library and supported the physician Ibn al-Nafis. Early in life he served as bodyguard to As-Salih Ayyub and he expected Pervane to aid him at the battle of Elbistan, though the Sultanate of Rum was eventually able to repel him with the aid of the Mongols. His first great victory came in 1250 when, after initial setbacks at Damietta and Mansurah, he defeated the Seventh Crusade of Louis IX at Fariskur. He achieved his greatest victory while serving under his predecessor Qutuz at Ain Jalut. For 10 points, name this founder of Egypt's Mamluk dynasty.
This man sent a letter describing the horrors he visited upon Antioch addressed to Count
{Baibars} or {Abu al}-{Futuh} or {al}-{Malik al}-{Zahir Rukn al}-{Din Baibars al}-{Bunduqdar}