This is a comprehensive rewrite and expansion of my original 2017 post, recently undertaken by Dr Richard Brownfield. It pulls together a lot of different sources and is as full a historic description of the street as can be achieved. A major piece of research and a fascinating read.
Westgate is the road that left Chichester by the West Gate leading out of the Roman walls. The actual gate was demolished in 1773 but the south pillar is still standing, complete with a hinge (pintle), beside the Indian Restaurant. Westgate is also used to describe the ancient western suburb of St Bartholomew’s in Chichester, which grew up along the road that emerged beyond the West Gate.