The Safavid order, also called the Safaviyya, was a tariqa (Sufi order) founded by the Kurdish mystic Safi-ad-din Ardabili (1252–1334). It held a prominent place in the society and politics of northwestern Iran in the fourteenth and fifteenth centuries, but today it is best known for having given rise to the Safavid dynasty. While initially founded under the Shafi'i school of Sunni Islam, later adoptions of Shi'i concepts such as the notion of the Imamate by the children and grandchildren of Safi-ad-din Ardabili resulted in the order ultimately becoming associated with Twelverism.