Wiki information Qirqis:

Jacob Qirqisani
Man, Person

Jacob Qirqisani was a Karaite dogmatist and exegete who flourished in the first half of the tenth century. He was a native of Circassia, which at the time probably still fell under Khazar overlordship. He seems to have traveled throughout the Middle...

Qirqisāni studies
Book Edition, Cataloged instance