In 1387, John of Gaunt's grandson was born to Mary de Bohun, in the Queen's Chamber within the gatehouse of Monmouth Castle, while his father Henry Bolingbroke was hunting in the area.
Pada tahun 1387, cucu John dari Gaunt dilahirkan oleh Mary de Bohun di Queen's Chamber di dalam menara gerbang Monmouth Castle, sementara ayahnya, Henry Bolinbroke, berburu di daerah tersebut.