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.
Ahmad Shirazi Khwaja Abu Nasr Ahmad (Persian: خواجه ابو نصر احمد‎ ‎ ), better known as Ahmad Shirazi (احمد شیرازی ), also known as Ahmad(-e) Abd al-Samad (احمد الکترونیکی عبد صمد ), was a Persian "vizier" of the Ghaznavid Sultan Mas'ud I and the latter's son Mawdud from 1032 to 1043. He was the son of the Samanid secretary Abu Tahir Shirazi, and had a son named Abd al-Hamid Shirazi, who would also later serve as "vizier".