The Roman `Brexit`: how life in Britain changed after 409 AD
(PHYSorg.com Archaeology & Fossils)

Leaving a major political body is nothing new for mainland Britain. In 409AD, more than 350 years after the Roman conquest of 43AD, the island slipped from the control of the Roman Empire. Much like the present Brexit, the process of this secession and its practical impacts on Britain`s population in the early years of the 5th century remain ill-defined.