Who was Jutta of Saxony's father-in-law?
Eric IV of Denmark Eric IV, also known as Eric Ploughpenny or Eric Plowpenny (Danish: "Erik Plovpenning" ), (  1216 – 10 August 1250) was king of Denmark from 1241 until his death in 1250. He was the son of King Valdemar II by his wife, Berengaria of Portugal, and brother of King Abel and King Christopher I.
Frederick I, Margrave of Brandenburg-Ansbach Frederick I of Ansbach and Bayreuth (also known as Frederick V; German: "Friedrich II. von Brandenburg-Ansbach-Kulmbach" or "Friedrich der Ältere" ; 8 May 1460 – 4 April 1536) was born at Ansbach as the eldest son of Albert III, Margrave of Brandenburg by his second wife Anna, daughter of Frederick II, Elector of Saxony. His elder half-brother was the Elector Johann Cicero of Brandenburg. Friedrich succeeded his father as Margrave of Ansbach in 1486 and his younger brother as Margrave of Bayreuth in 1495.