Yāqūt Shihāb al-Dīn ibn-'Abdullāh al-Rūmī al-Hamawī (1179–1229) (Arabic: ياقوت الحموي الرومي) is famous for his great "geography", Mu'jam ul-Buldān, an encyclopedia of Islam written in the late Abbāsid era and as much a work of biography, history and literature as a simple work of geography.