Friedrich married Yolanthe De Brienne on 9 Nov 1225. Yolanthe (daughter of Jean Count De Brienne, [KING OF JERUSAL and Berenguela Princess Of Leon And Castile) was born in 1211 in Of, BRIENNE, France; died on 5 May 1228. [Group Sheet] [Family Chart]

Friedrich married Isabel Princess Of England, [EMPRESS OF GERM on 20 Jul 1235 in , Worms, Rhinehessen, Hesse-Darmstadt. Isabel (daughter of John "Lackland" King England and Isabella De Taillefer, [QUEEN OF ENGLAN) was born in 1214 in Of, Winchester, Hampshire, England; died on 1 Dec 1241 in , Foggia, Apulia, Italy; was buried in Andria, Bari, Apulia, Italy. [Group Sheet] [Family Chart]

Friedrich married Constanza Alfonsez Princes, OFARAGON in Feb 1210. Constanza (daughter of Alfonso Ii "the King Of Aragon and Sancha Alfonsez Princes, [QUEEN OF ARAGON) was born in Of, Zaragoza, Zaragoza, Spain; died on 23 Jun 1222. [Group Sheet] [Family Chart]