- According to Jean Froissart, he is the brother of Raymond Bernard III de Castelnau, lord of Castelnau-Tursan. [ See The Online Froissart: Book II, folio 69r, 2-211]
- Member of the Earl of Cambridge's expedition to Lisbon (1381) to assist King Fernando of Portugal in the war against Juan I of Castile.
- Bibliography: ‘The Online Froissart,’ Translation of Book II, Folio 69 r, 2-211, http://www.hrionline.ac.uk/onlinefroissart [accessed May 18, 2016].
Castelnovo