The Greys produced among others, Sir Richard de Grey (later 4th Baron), who pursued a distinguished career in the service of Edward III: Admiral of the Thames and South, King's Chamberlain, Deputy Constable of the Tower, Marshal of All England and Keeper of several castles. Granted substantial lands on the Welsh Marches, he was responsible for crushing Owain Glyndŵr's rebellion in 1410 and as Steward of Sherwood Forest and Constable of Nottingham Castle, his responsibilities later extended into the lawless lands of the South Wales valleys becoming Justiciar of Wales; subsequently he was posted on a diplomatic mission to Gascony, assuming the captaincy of Argentan Castle, during Henry V's second French expedition in 1417. He married Elizabeth, younger daughter and co-heir of Ralph, 1st Baron Basset. Lord Grey died on 1 August 1418, leaving numerous issue.