High Quality Content by WIKIPEDIA articles! Alianore Holland, Countess of March (1373 – October 1405) was an English noblewoman, and the wife of Roger Mortimer, 4th Earl of March the heir presumptive of her half-uncle King Richard II of England, and Lord Lieutenant of Ireland. She was the mother of Anne Mortimer, and Edmund Mortimer, 5th Earl of March. Through Anne, Lady Alianore was the great-grandmother of Yorkist kings, Edward IV and Richard III. She held the post of Governess to Queen consort Isabella of Valois.