Richard Brooke, Visits to Fields of Battle, in England…
“ Edward was Earl of March and Ulster, and Lord of Wigmore and Clare, and afterwards King Edward IV.; and, although not usually called Duke of York by historians, there does not seem to be any reason why he was not so called, between the time of his father’s death, and his accession to the throne of England. Edward was the eldest son of Richard Plantagenet, Duke of York, and Cecily his wife, and was born at Rouen, in Normandy, on the 29th of April, 1441. ”
