William de Moulton

Appears to be Sir Hubert's son, not Thomas'.

Estate ownership records of Isel Hall, northeast of Cockermouth, Cumbria, England: https://en.wikipedia.org/wiki/Isel_Hall : William de Multon > Margaret m. (an earlier) Sir William de Leigh >>>(eventually) the Leigh MPs. (And if she was marriageable in 1315, William had an earlier wife, name lost in time.)

Page #290 of The History and Topography of the Counties of Cumberland and Westmoreland (1860), noting the ancestry of William Del Dykes, husband of Elizabeth De Leigh: https://books.google.com/books?id=ZkJCAQAAMAAJ&pg=PA290&lpg=PA290&d...