During the sixteenth century, when Monmouth became the county town of the newly formed shire of Monmouth, the county's Courts of Assize began to be held in the castle's Great Hall.
Selama abad ke-16, ketika Monmouth menjadi kota county dari shire Monmouth yang baru terbentuk, Pengadilan Assize county mulai menyelenggarakan sidang di Great Hall di kastil ini.