Katharine Keats - Rohan states that Walter married Isabel and states that his widow gave an endowment to the cathedral chapter of Salisbury Cathedral for the sake of Walter 's soul .
Isabel is a daughter of Ralph de Tosny .
Katharine Keats - Rohan states that Walter married Isabel , a daughter of Ralph de Tosny , and states that his widow gave an endowment to the cathedral chapter of Salisbury Cathedral for the sake of Walter 's soul .