Ja`far ibn Yay

(from the article `Barmakids`) ...no surprise that he put the whole administration in the hands of Yay and his sons. Yay received the title of wazr, and his sons al-Fal and Ja`far ... ...empire reaching from the western Mediterranean to India. He made Yay the Barmakid his vizier, or chief minister. With Yay were associated his sons ... ...
Found on http://www.britannica.com/eb/a-z/j/3
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