William, Count of Mortain
William, Count of Mortain (1074–1120) was the son of Robert, Count of Mortain, the half-brother of William I of England.
He joined the rebellion of Robert Curthose against Henry I of England, and was captured at the Battle of Tinchebrai and stripped of his lands. William spent the rest of his life in captivity, dying without issue.
Preceded by: Robert |
Count of Mortain 1104–1106 |
Succeeded by: Robert II |