Called the great, Duke of Brunswick, who died in 1278. He/She was the son of Otto and left States with his brother. In his father's life already reported, response to Přemysl, King of Bohemia, against bullet IV, King of Hungary. He/She beat Federico, count of Eberstein and Gerardo, Archbishop of Mainz, who made an inspection of their States, making the first hang and holding another prisoner for a year. He/She said a war with the landgrave of Thuringia, Enrique the illustrious, which was taken prisoner and owed their freedom to a strong rescue. Fought the widow Queen of Denmark and his son Eric, prisoner in Holstein, and the Queen in gratitude, wanted to take him for a husband, but people objected and had to resign.