Lady Sibyl Montagu Peerage person ID=116491 (b. 1330) Parents Catherine Montagu, Countess of Salisbury William Montagu, 1st Earl of Salisbury Children Philippa FitzAlan Siblings Philippa de Montagu John de Montacute, 1st Baron Montacute Lady Elizabeth Montagu William de Montacute, 2nd Earl of Salisbury Partners Edmund FitzAlan