Answer
Rashid al-Din Hamadani was accused of poisoning Öljaitü, the Ilkhanid ruler of Iran and Iraq, in 1316. The accusation was made by Öljaitü's son Abu Said Bahadur Khan, who had Rashid al-Din executed. There is no evidence to support the accusation, and it is likely that Abu Said was motivated by political reasons to remove Rashid al-Din from power.