Al-Manṣūr and al-Mahdī would single him out because of his eloquence, putting up with his eccentric manners, and he left behind a collected set of epistles.
He was fluent and silver-tongued, generous and much praised, yet also overbearing and haughty—his pride became proverbial.
He was entrusted with several high-ranking posts.
When Yaḥyā ibn Khālid al-Barmakī once had his property seized, he sent his son to ʿUmārah to borrow two hundred thousand dinars. ʿUmārah provided the sum. Later, when Yaḥyā’s fortunes improved and he sent the money back, ʿUmārah frowned and said, “Were you acting as his money-changer?” Then he turned to Yaḥyā’s son, al-Faḍl ibn Yaḥyā, and said, “Keep it—it is yours.”
ʿAbd Allāh ibn Abī Ayyūb said: “ʿUmārah gave my father three hundred thousand dirhams.”
It is also reported that a delegation came to him interceding for some people; he ordered that they be granted one hundred thousand dirhams. His wealth in cash and livestock was immense.

70 – ʿUbayṣ ibn Maymūn Abū ʿUbaydah al-Tamīmī * (Q)
The ḥadith master, Abū ʿUbaydah al-Taymī, al-Raqāshī, from Basra, the cloth-dealer.
He narrated from Bakr al-Muzanī, Muʿāwiyah ibn Qurrah, Thābit, Yaḥyā ibn Abī Kathīr, al-Qāsim ibn Muḥammad—if indeed he met him—ʿAwn ibn Abī Shaddād, and others.