William IV , Baron Dunster In Somerset De Mohun

William IV , Baron Dunster In Somerset was born in 1159.  William IV , Baron Dunster In Somerset's father was William III , Baron Dunster De Mohun and his mother was Godeheut , Heiress of Brinkley de Toeni.  His paternal grandparents were William II ,Earl Somerset, Baron Dunster De Mohun and Agnes De Gaunt.  He was an only child.  He died at the age of 34 in October 1193 in pilgramage to Jerusalem.

They had a son named Reynold , Baron Dunster.