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Family William de Montagu, 1st Earl of Salisbury & Katherine de Grandison Click to view William de Montagu, 1st Earl of Salisbury & Katherine de Grandison in the family tree Click to view William de Montagu, 1st Earl of Salisbury & Katherine de Grandison in the family tree

William and Katherine were married in a religious ceremony in 1327 in Cassington, Oxfordshire, England.  They had two sons and two daughters, named John, William, Elizabeth and Sibyl.