Binbiroklu Ahmet Baba was one of the first raider-commanders of the Ottoman expansion into Rumelia under Sultan Murad I, martyred during the conquest of Pınarhisar in 1369. His octagonal domed 14th-century tomb stands at the entrance of Erenler village, Pınarhisar district, open to visitors. (Sources: Kültür Portalı; Pınarhisar District Governorate; Kültür Envanteri.)