The Romans arrived in the lands of the Cornovii in 48 AD and defeated them at a battle at The Wrekin. By 70 AD the Romans had founded the fortress and town of Deva Victrix, now Chester, according to ancient cartographer Ptolemy, The fortress was 20% larger than other fortresses in Britannia built around the same time at York (Eboracum) and Caerleon (Isca Augusta); this has led to the suggestion that the fortress, rather than London (Londinium), was intended to become the capital of the Roman province of Britannia Superior. The civilian amphitheatre, which was built in the 1st century, could seat between 8,000 and 10,000 people. It is the largest known military amphitheatre in Britain, and is also a Scheduled Monument.