Genealogy of Jelālu-’d-Dīn, Rūmī. On his father's side, the remote ancestor of Jelālu-’d-Dīn, during Islāmic times, was Abū-Bekr, the dearest and most faithful friend of Muhammed the Arabian lawgiver, and his successor in the government of the community of Islām, as the first of the long line of Caliphs. Like Muhammed himself, Abū-Bekr was of the tribe of Quraysh, which claims descent, through Ishmael, from Abraham, the chosen Friend of God, and Father of the faithful.