The Ancient Cymri had called the place Porth Hamon after a certain Lelius Hamo, a traitor who had murdered king Togodumnus during the early stages of the Roman invasion of Britain.
Following the Roman invasion of Britain in AD 43 and the conquering of the local Britons in 70 AD the fortress settlement of Clausentum was established. It was an important trading port and defensive outpost of Winchester. Clausentum was defended by a wall and two ditches and is thought to have contained a bath house. Clausentum was not abandoned until around 410.
Hantonne will one day become the modern city of Southampton.