Barmakids - Wikipedia
The Barmakids (Persian: ... Khalid, the son of Barmak became the prime minister of Al Saffah, the first Caliph of the Abbasid dynasty. His son Yahya aided Harun Al-Rashid in capturing the throne and rose to power as the most powerful man in the Caliphate. The Barmakids were remarkable for their majesty, splendor and hospitality.