Background
The strategic importance of Portchester has been recognised since at least the 3rd century when a Roman fort was established on the site of the later castle. Though it is uncertain exactly when the fort was constructed, it is thought it was built by Marcus Aurelius Carausius on the instructions of emperor Diocletian between 285 and 290. It was one of several forts built along the British coast in the period to combat raids by pirates. Portchester was probably a base from which the Classis Britannica, the Roman fleet defending Britain, operated. It is the best preserved Roman fort north of the Alps. Although the Roman army retreated from Britain in the early 5th century, it is unlikely that the fort was ever completely abandoned, although its use continued on a much smaller scale. A 10th-century hall and tower were discovered within the fort, suggesting it was a high-status residence during the Saxon period. In 904, Portchester came into the possession of King Edward the Elder and the fort became a burh to help defend the country against Vikings.
Read more about this topic: Portchester Castle
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