Guelph IV Duke of Bavaria

Guelph IV Duke of was born about 1040 in Este, Italy.  Guelph IV Duke of's father was Alberto Azzo II Marquis d' Este and his mother was Cunigunde of Altdorf. He had a half-brother named Hugo III du.  He died on November 6th, 1101.  He was buried in Crusader.

‌Guelph IV Duke of and Judith of were married in a religious ceremony in 1071 in 2nd husband.  They had a son named Henry I Duke of.