Seyyid Ali Sultan, known as 'Kızıl Deli', was a Vefai-Kalenderi dervish counted among the greatest Bektashi saints. According to his Velâyetnâme he came from Khorasan with forty companions to support Bayezid I's Balkan campaigns, working with Gazi Evrenos in the conquest of Gallipoli, Didymoteicho, Edirne and İpsala. Around 804/1402 he founded a tekke beside the Kızıl Deli stream near Didymoteicho, and Bayezid I endowed him the revenues of three villages. His lodge was one of the four most important Bektashi tekkes and one of the oldest preserved in the Balkans; his tomb is at Darıbükü (Roussa, Evros). Documents show him alive in 1412, so TDV gives his death as 'after 815/1412'. (Sources: TDV İslam Ansiklopedisi 'Seyyid Ali Sultan'; TEİS; Kültür Envanteri)