Nicholas I of Opava

Nicholas I of Opava (c. 1255–1318) was the natural son of King Ottokar II of Bohemia. Legitimated with papal consent and enfeoffed with Opava in 1269, he founded the Silesian Přemyslid line. He fought for Ottokar at the Marchfeld in 1278, was captured by the Hungarians, and recovered his duchy from Rudolf of Habsburg, whose niece he married in 1283.

After the Přemyslids died out in 1306 he had to accept the pledging of Opava, which John of Bohemia redeemed in 1318 for his son Nicholas II; Nicholas died the same year.