Tags: Noble.
John I of Opava-Ratibor (Czech: Jan I. Ratibořský; German: Johann I. von Troppau-Ratibor; c. 1322 – c. 1380-1382) was the founder the Opava branch of the Bohemian Přemyslid dynasty which lasted until 1521. In 1365 he became the sole heir of the Duchy of Racibórz. From 1367 to 1377 he ruled the Duchy of Opava (German: Troppau) jointly with his brothers Nicholas III Wenceslaus I and Przemko I. From 1377 until his death he was also Duke of Krnov and Bruntál.