Ubaydallah ibn Abdallah ibn Tahir
Abu Ahmad Ubaydallah ibn Abdallah ibn Tahir (Arabic: أبو أحمد عبيد الله بن عبد الله بن طاهر, c. 838 – May 913) was a ninth century Tahirid official and military officer.
Source: Wikipedia — Ubaydallah ibn Abdallah ibn Tahir (CC BY-SA 4.0)