From "The Peerage of Ireland" (and other sources) p.67 Fitz-Gerald, Duke of Leinster. "...die at Rouen (English called it Roan) in Normandy, 10 August 1420, he was buried in a convent (Notre Dame ?) of friars preachers at Paris (where Marlburg says he died) the King of England (Henry V) attended his funeral.
He left two sons, Maurice and John (of Claragh, Ireland) who died in 1452 ; in which year also Maurice being killed by Connor O'Mulrian, he was buried at Roan " (Rouen, or with his father ?)
Print of Rouen in 1418 in an excellent (as usual) book by Antonia Fraser "The lives of the Kings & Queens of England" on page 131.
Marlburg may have been a Professor of History in Paris ? Perhaps there is a burial register for Notre-Dame or the Convent of Friars Preachers, Paris ?
However, it is hard to reconcile this "Earl of Desmond, fitz-Gerald family" with the dates of the supposed grand-son, Robert Adair c.1424-ish in Portree, Wigtownshire, Scotland.Any help would be greatly appreciated, especially of Notre-Dame and Convent of Friars Preachers, Paris.