Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says that on the occasion of the Conquest of Makkah, he (peace and blessings be upon him) appointed Abu Ruhm Kulthum bin al-Husayn bin Ubayd bin Khalaf al-Ghifari as governor of Madinah in his absence.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17895