Monmouth Castle was established in the late 1060s by William Fitz Osbern. It was here that the future King Henry V was born in 1387,
The Office of Works took over responsibility for Monmouth Castle in 1906. A.J. Taylor prepared the official Ministry guide for Monmouth Castle and Great Castle House in 1951. The 1969 edition was prepared by MPBW on behalf of the Welsh Office. The guide is divided into two parts: history and description (The medieval town and its defences; the castle; Great Castle House). There are three plans: one of Monmouth; the second for the Great Tower; and the third, on a foldout plan inside the back cover, of the castle.