Oldcastle

UK: /ˈəʊldˌkɑːs^əl/ US: (ōld′kas′əl, -kä′səl)

WordReference Random House Unabridged Dictionary of American English © 2025

Old•cas•tle  (ōld′kas′əl, -kä′səl), n. 

1. Biographical Sir John (Lord Cobham), 1377–1417, English martyr: leader of a Lollard conspiracy;
   executed for treason and heresy;
   model for Shakespeare's Falstaff.

Collins Concise English Dictionary © HarperCollins Publishers::

Oldcastle / ˈəʊldˌkɑːs^əl/ noun

1. Sir John, Baron Cobham. ?1378–1417, Lollard leader. In 1411 he led an English army in France but in 1413 he was condemned as a heretic and later hanged and burnt. He is thought to have been a model for Shakespeare's character Falstaff in Henry IV