When was the first fortification built on the site, and why was it chosen by the Romans?

The first 200 words of this essay...

When was the first fortification built on the site, and why was it chosen by the Romans?

The Romans decided to build a series of 'Saxon shore forts' to defend the south coast from the Saxons. Evidence shows (mainly from coins) that Portchester castle was built at the end of 3rd Century AD. Portchester was a perfect place for the Romans to build a fort for many reasons. Portchester Castle was built on a promontory. This was perfect for the Romans because it would dramatically slim the chances of the Saxons invading. The Castle sticks out into the sea with a good view. The only way and invaders could invade would either be to cross the marsh that was Portsmouth or from in-land. Another reason Portchester was built where it was because of the extremely deep harbour. The deep harbour was perfect for the Royal Navy's fleet to dock. At present time, the harbour is not deep at all because of silt. Over many hundreds of years Portchester harbour has silted up and become un-useable.

The Saxon shore forts were dotted along the south-east coast of England. A table follows of the Roman names of the