As I explained in my introduction to the City of London, it was the Romans who first laid the foundation stones for the metropolis that we call London today.
After the failed attempts by Julius Caesar to conquer Britain in 55 and 54 BC, Emperor Claudius brought a larger army and made a successful invasion in 43 AD. He landed on the Kent coast near Richborough and headed towards the River Thames, where, after another successful battle, he was able to cross the river somewhere near Westminster.
It wouldn’t have taken him long to realise the strategic location of a place just downstream at where the river narrowed. Not only could the river be bridged, but it was also navigable up to this point, and so near to where London Bridge stands today, he set up camp on the north side of the river.
The location was also suitable for expanding a road system that could spread out across the country, and it wasn’t long before Londinium became an important trading post, both by road and by river. As the town grew though, so did the opposition to the conquerors and a revolt led by Boudicca left Londinium practically in ruins. However, there were very few casualties and the town was soon re-built.