Frederick (Czech: Bedřich) (c. 1142 – 25 March 1189), a member of the Přemyslid dynasty, was Duke of Bohemia from 1172 to 1173 and again from 1178 to his death.
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👉 Frederick of Bohemia in the context of Louis I Wittelsbach, Duke of Bavaria
Ludwig I (23 December 1173 – 15 September 1231), called the Kelheimer or of Kelheim, since he was born and died at Kelheim, was the Duke of Bavaria from 1183 and Count Palatine of the Rhine from 1214. He was the only surviving son of Otto I, Duke of Bavaria (the first duke from the House of Wittelsbach) by his wife Agnes of Loon. He married Ludmilla of Bohemia, a daughter of Duke Frederick of Bohemia.