Ghazan Khan's conversion to Islam in 1295 heralded for Persian Jews in Tabriz a pronounced turn for the worse, as they were once again relegated to the status of dhimmis (Covenant of Omar). Öljeitü, Ghazan Khan's successor, destroyed many synagogues and decreed that Jews had to wear a distinctive mark on their heads; Christians endured similar persecutions. Under pressure, many Jews converted to Islam. The most famous such convert was Rashid-al-Din Hamadani, a physician of Hamadani origin who was also a historian and statesman; and who adopted Islam in order to advance his career in Öljeitü's court in Tabriz. However, in 1318 he was executed on charges of poisoning Öljeitü and his severed head was carried around the streets of Tabriz, chanting, "This is the head of the Jew who abused the name of God; may God's curse be upon him!" About 100 years later, Miranshah destroyed Rashid al-Din's tomb, and his remains were reburied at the Jewish cemetery.