South Glamorgan is a preserved county of Wales. It was
originally formed in 1974 under the Local Government Act 1972, as a
county council area. It consisted of the county borough of Cardiff
along with the southern part of the administrative county of
Glamorgan, and also the parish of St Mellons from Monmouthshire.
These areas were divided between two districts: Cardiff and Vale of
Glamorgan. Of the counties created in the Act, this was an unusually
low number of districts, with only the Isle of Wight being the only
other county with two. As well as Cardiff, the county included the
main towns of Barry, Cowbridge, Llantwit Major and Penarth.