The settlement probably shrank in size and may even have been abandoned.
In the absence of Roman rule, Wales was divided into small kingdoms; early on, Meurig ap Tewdrig emerged as the local king in Glywysing (which later became Glamorgan).
The city is the country's chief commercial centre, the base for most national cultural and sporting institutions, the Welsh national media, and the seat of the National Assembly for Wales.
The unitary authority area's 2016 population was estimated to be 361,468, The Cardiff Urban Area covers a slightly larger area outside the county boundary and includes the towns of Dinas Powys and Penarth.
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) is the capital and largest city in Wales and the eleventh-largest city in the United Kingdom.
Coins from the reign of Gratian indicate that Cardiff was inhabited until at least the 4th century; the fort was abandoned towards the end of the 4th century, as the last Roman legions left the province of Britannia with Magnus Maximus.
Cardiff was made a city in 1905, and proclaimed the capital of Wales in 1955.
It was likely made up of traders who made a living from the fort, ex-soldiers and their families. Contemporary with the Saxon Shore Forts of the 3rd and 4th centuries, a stone fortress was established at Cardiff.
Similar to the shore forts, the fortress was built to protect Britannia from raiders.
The area passed through his family until the advent of the Normans in the 11th century.
The castle was substantially altered and extended during the Victorian period by John Crichton-Stuart, 3rd Marquess of Bute, and the architect William Burges.