Seyyid Ali Sultan, called Kızıl Deli ("Red Madman"), was a Vefâî-Kalenderi/Bektashi dervish who, per his Velâyetname, came from Khorasan with forty companions and accompanied Ottoman commanders in the Balkan conquests. Around 1400–1403 he founded a tekke by the Kızıl Deli stream (Erythropotamos) near Dimetoka; Bayezid I endowed him with three villages (804/1402). His türbe lies within the tekke complex near Roussa village in Evros, Greek Thrace, beside a roughly 600-year-old mulberry tree held to be miraculous; in Bektashism it ranks second in importance only to Hacıbektaş. (Sources: TDV İslam Ansiklopedisi 'Seyyid Ali Sultan'; Wikipedia 'Seyyid Ali Sultan Tekke'; Kültür Envanteri; Wikidata Q15442756.)