It is one of the best preserved Saxon forts and its lofty position on the south coast made it a perfect part of the defence strategy for the Solent for hundreds of years.
Over the years the castle has also been a favourite with historians and re-enactments, which regularly take place within the stone walls.
Here are some of our favourite memories of Portchester Castle.
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9. Portchester Castle memories
A view of Portchester Castle on July 13, 1984. The News PP3894 Photo: The News archive
10. Portchester Castle memories
A shot of Portchester Castle with HMS Tiptoe in view on July 13, 1973. The News PP3897 Photo: The News archive
11. Portchester Castle memories
Henry VIII is one of the characters in a history through the ages presentation at Portchest Castle (undated). The News PP3901 Photo: The News archive
12. Portchester Castle memories
Portchester Castle from the path on March 11, 1985. The News PP3896 Photo: The News archive