Ubaydallah ibn Abdallah ibn Tahir was the last major Tahirid to hold high office in what dynasty?
Tahirid dynasty The Tahirid dynasty (Persian: طاهریان‎ ‎ , "Tâhereyân") was a dynasty, of Persian dihqan origin, that governed the Abbasid province of Khorasan from 821 to 873 and the city of Baghdad from 820 until 891. The dynasty was founded by Tahir ibn Husayn, a leading general in the service of the Abbasid caliph al-Ma'mun. Their capital in Khorasan was initially located at Merv but was later moved to Nishapur. The Tahirids enjoyed a high degree of autonomy in their governance of Khorasan, but they remained subject to the Abbasid caliphate and were not independent rulers.
Bahdal ibn Unayf al-Kalbi Bahdal ibn Unayf ibn Walja ibn Qunafa al-Kalbi (died ca. 650s) was the chieftain of the Banu Kalb during early Muslim rule in Syria until his death in the mid-650s. A Christian like most of his tribesmen at the time, Bahdal secured a prominent role for his family and the Banu Kalb by marrying off his daughter Maysun to the future caliph Mu'awiyah I (r. 661–680), while the latter was governor of Syria (639–661). Maysun would give birth to Mu'awiyah's son and successor, Yazid I (r. 680–683). Though Bahdal died before 657, his forging of ties with the Umayyads secured his descendants and tribesmen the most prominent positions in the Umayyad court and military, so much so that partisans of the Umayyads became known as ""Baḥdaliyya"". Bahdal's grandchildren led the Yaman faction in the wars with Qays, a rival tribal confederation.