Feodor Ostrogski was a 14th-century Rurikid prince and magnate who held significant power in Volhynia. Born around 1360, he served as the governor of Volhynia and held various titles, including Starosta of Loutsk. His political life was marked by involvement in the Hussite Wars and various conflicts within the Grand Duchy of Lithuania. After a career defined by military leadership and territorial administration, he entered monastic life, eventually dying in Kyiv in 1446.