William IV (or Guillem IV) was the

Lord of Montpellier The following is a list of lords of Montpellier: * William I of Montpellier 26 November 986–1019 * William II of Montpellier 1019–1025 * William III of Montpellier 1025–1058 * William IV of Montpellier 1058–1068 * William V of Montpel ...

from 1058 until his death in 1068.Archibald R. Lewis, "The Guillems of Montpellier: A Sociological Appraisal", ''Viator'', 2 (1971), 159–60. He was the son of William III and Beliardis. He was married to Ermengarde, daughter of Raymond I, Count of Melgueil. He is the first of his dynasty with charters preserved in the family

cartulary A cartulary or chartulary (; Latin: ''cartularium'' or ''chartularium''), also called ''pancarta'' or ''codex diplomaticus'', is a medieval manuscript volume or roll (''rotulus'') containing transcriptions of original documents relating to the fo ...

, the '' Liber instrumentorum memorialium''. They record agreements concerning some local castles in 1059. He was succeeded by his son,

William V William V may refer to: * William V, Duke of Aquitaine (969–1030) *William V of Montpellier (1075–1121) * William V, Marquess of Montferrat (1191) * William V, Count of Nevers (before 11751181) *William V, Duke of Jülich (1299–1361) * Willia ...

Notes

Lords of Montpellier Guilhem dynasty 1068 deaths Year of birth unknown {{Montpellier-stub