The site was originally built in the late 1930s for WWII and was the biggest munitions factory in the UK at its peak of production.
Cafodd y safle ei adeiladu’n wreiddiol ar ddiwedd y 1930au ar gyfer yr Ail Ryfel Byd, a hwn oedd y ffatri arfau mwyaf yn y DU pan oedd ar ei anterth.