Background
He was the second son of King Abel of Denmark, and Mechtild of Holstein.
He was the second son of King Abel of Denmark, and Mechtild of Holstein.
He was the ruling from 1260 until his death in 1272. Subsequently, Eric participated in the coalition of Bishop Peder Bang of Roskilde and Prince Jaromar II of Rugia against King Christopher. He took part in the military campaign of 1259 which resulted in the conquest of Copenhagen.
After the death of Christopher in 1259, he was created by the new king Eric V in 1260.
Already the following year, fighting with the king broke out anew. The Queen Dowager, Margaret Sambiria, acting as regent for her under age son, feared aggression from the Duke.
However, Duke Eric was able to defeat the royal army at the Battle of Lohede and capture the young King Eric and his mother. As a result, he was able to obtain huge advantages for his duchy at the subsequent treaty in 1264.
In 1268 he acquired Gottorp Castle from Bishop Bonde of Schleswig, who then moved his residence to Schwabstedt.
Duke Eric died 27 May 1272.