Danylo (Andriy) Ostrozky (Ukrainian: Данило Острозький; Polish: Daniel Ostrogski; died after 1366) was a Ruthenian nobleman, probably Prince of Turaŭ, first Prince of Ostroh, and founder of the Ostrozky House.
Some scholars claim that his grandfather was Vasylko Romanovych, Prince of Slonim and direct descendant of Roman of Galicia, others however claim his origin in line of Sviatopolk II of Kyiv and suppose that his father was Danylo.
[4] Danylo was probably only temporary supporting King Casimir, because in 1344 he called the Tatars to fight for Galicia in the Galicia–Volhynia Wars,[5] like Dmytro Dedko who died in the same year.
Finally Prince Danylo allied to Liubartas who also rivaled for Galicia with Tatars, Poles and Hungarians.
He received Ostroh from Liubartas, King of Galicia–Volhynia,[1] where he rebuilt the castle destroyed by the Tatars.