He is married to Matilda "Maud" de CHAWORTH, COUNTESS OF LANCASTER.
They got married on March 2, 1297 at Kidwelly, Carmarthenshire, Wales, he was 16 years old.Source 1
Child(ren):
http://trees.ancestry.com/pt/AMTCitationRedir.aspx?tid=52216331&pid=3645/ Ancestry.com
Name: Henry 'Wryneck' 3rd Earl of Lancaster Plantagenet birth date: 1281 birth place: Grismond Castle, Monmouth, England death date: 22 Sep 1345 death place: Monastry of Cannons, Leicester, Leicestershire, England/ Ancestry.com