Griffiths Wheeler Thatcher, 1911 Encyclopædia Britannica, Volume 12… (1911)
“ HĀJJĪ KHALĪFA [in full Muṣṭafā ibn ʽAbdallāh Kātib Chelebī Hājjī Khalīfa] (ca. 1599–1658) , Arabic and Turkish author, was born at Constantinople. He became secretary to the commissariat department of the Turkish army in Anatolia, was with the army in Bagdad in 1625, was present at the siege of Erzerum, and returned to Constantinople in 1628. In the following year he was again in Bagdad and Hamadān, and in 1633 at Aleppo, whence he made the pilgrimage to Mecca (hence his title Hājjī) . The following year he was in Erivān and then returned to Constantinople. ”
