We are not sure what happened between 400 and 1068. Did any of the Roman walls survive through this period? A grant of land made during the seventh century refers to the "city wall towards the south and a great gate towards the west".
The gateways through the defences in York are called 'bars'. The name 'bar' has its origins in the bars, or simple gates, which were used to block the gateways to keep people out