Sir John Grey, English nobleman and soldier, of Ruthin, Denbighshire, Wales, Badmondisfield, Suffolk, Great Gaddesden, Hertfordshire, etc., second but eldest surviving son and heir apparent of Sir Reginald Grey, 3rd Baron Grey de Ruthyn by his 1st wife, Margaret Roos. He was also Captain of Gournay. He was Lord Lieutenant of Ireland in 1427-28, acting mainly through the Bishop of Meath as his Deputy.