The Mevlevi Order or the Mevleviye are a Sufi order founded by the followers of Jalal ad-Din Muhammad Balkhi-Rumi, a 13th century Persian poet, Islamic jurist, and theologian, in Konya (in present-day Turkey). They are also known as the Whirling Dervishes due to their famous practice of whirling as a form of dhikr (remembrance of Allah). Dervish is a common term for an initiate of the Sufi Path.
http://en.wikipedia.org/wiki/Whirling_dervish