Rumi (Jalāl ad-Dīn Muḥammad Balkhī)

Jalāl ad-Dīn Muḥammad Balkhī was a 13th-century Persian poet, jurist, theologian, and Sufi mystic. Rūmī is a descriptive name meaning "the Roman" since he lived most of his life in an area called Rūm because it was once ruled by the Byzantine Empire. (Source.)