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The governor's palace at Londinium, watercolour by Alan Sorrell via the Museum of London. "This watercolour depicts the Governor's Palace which would have been between Upper Thames Street and Cannon Street and is now Cannon Street station."
Education | Historic England
This is a reconstruction drawing of what the Roman fort at Portchester looked like in AD 345. Archaeological excavations suggest the Roman fort at Portchester was built between AD 285-290. It's building probably relates to a series of 'barbarian' (Saxon) attacks along the coasts of Britain and Gaul (France) at this time.