Lady Constance de Holand (1387-1437) (1387–1437) Parents John Holland, 1st Duke of Exeter Elizabeth of Lancaster, Duchess of Exeter Children Edmund Grey, 1st Earl of Kent Thomas Grey, 1st Baron of Richemount Grey Siblings John Holland, 2nd Duke of Exeter Edward de Holand Richard de Holand Alice de Holand Sir John Cornwall Constance Cornwall Partners John Grey Thomas de Mowbray, 4th Earl of Norfolk