William (1st Baron of Mauny) De Mauny

 Margaret Marshal (Duchess O Norfolk) Plantagenet
Margaret Marshal (Duchess O Norfolk) was born in 1322 in ,,Norfolk,England.¹   She died at the age of 77 on March 24th, 1399 in Carthusian Church,de Grey Friars,London,England.¹ 

 Anne De Mauny
Anne was born in 1354.  She died at the age of 30 in 1384.