Ibn Shihab said: Syria was under two governors: Abu Ubaydah bin al-Jarrah and Yazid bin Abi Sufyan. Then Abu Ubaydah died, and he appointed his maternal uncle Iyad bin Ghanm, one of Banu al-Harith bin Fihr, as his successor, and Umar (may Allah be pleased with him) confirmed him in that post. Then Iyad died, and he appointed Sa'id bin Amir bin Judhaym governor in his place. Then Sa'id bin Amir died, and he appointed Umayr bin Sa'd governor in his place.
Hadith Referenceالمعجم الكبير للطبراني / العشرة / 362