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.
Ibn Kathir Ismail ibn Kathir (Arabic: ابن كثير‎ ‎ , born c. 1300, died 1373) was a highly influential Sunni scholar of the Shafi'i school during the Mamluk rule of Syria, an expert on tafsir (Quranic exegesis) and faqīh (jurisprudence) as well as a historian. Al-Hafiz Ibn Hajar Al-Asqalani said about him, “Ibn Kathir worked on the subject of the Hadith in the texts (متون) and chains of narrators (رجال). He had a good memory, his books became popular during his lifetime, and people benefited from them after his death.”