Ubaydallah ibn Abdallah ibn Tahir was the last major Tahirid to hold high office in what dynasty?
Ubaydallah ibn Abdallah ibn Tahir Abu Ahmad Ubaydallah ibn Abdallah ibn Tahir (Arabic: أبو أحمد عبيد الله بن عبد الله بن طاهر‎ ‎ , ca. 838 – May 913) was a ninth century Tahirid official and military officer. He was the last major Tahirid to hold high office, having served as the governor of Baghdad at various points between 867 and 891.
Numayrid dynasty The Numayrids were an Arab dynasty based in Diyar Mudar (western Upper Mesopotamia). They were emirs (princes) of their namesake tribe, the Banu Numayr. The senior branch of the dynasty, founded by Waththab ibn Sabiq in 990, more or less continuously ruled the Euphrates cities of Harran, Saruj and Raqqa until the late 11th century. In the early part of Waththab's reign (990–1019), the Numayrids also seized Edessa, until the Byzantines conquered it in the early 1030s. In 1062, the Numayrids lost Raqqa to their distant kinsmen and erstwhile allies, the Mirdasids, while by 1081, their capital Harran and nearby Saruj were conquered by the Turkish Seljuks and their Arab Uqaylid allies. Numayrid emirs continued to hold isolated fortresses in Upper Mesopotamia, such as Qal'at an-Najm and Sinn Ibn Utayr near Samosata until the early 12th century, but nothing is heard of them after 1120.