William Willoughby, 5th Baron Willoughby de Eresby English peer (1370–1409) Parents Alice de Skipwith Robert Willoughby, 4th Baron Willoughby Children Sir Thomas Willoughby Elizabeth Willoughby Margaret Willoughby Robert Willoughby, 6th Baron Willoughby de Eresby Marjery Willoughby Siblings Margaret de Willoughby Sir Thomas de Willoughby Partners Lucy Lestrange Joan Holland