Abu al-Hasan al-Mazini (may Allah have mercy on him) said: "The name of the grandfather of Amr bin Yahya was Tamim bin Amr. Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) appointed him governor over Madinah when he set out for Iraq, at the time when Sahl bin Hunayf (may Allah be pleased with him) set out to join him."
Hadith Referenceالمعجم الكبير للطبراني / باب التاء / 1274