Well sort of. Its not actually a table. Its a meeting room. A giant meeting room seating up to 1000 knights, most likely its an amphitheatre.
http://www.telegraph.co.uk/news/uknews/7883874/Historians-locate-King-Arthurs-Round-Table.html
Historians locate King Arthur's Round Table
Historians claim to have finally located the site of King Arthur’s Round Table – and believe it could have seated 1,000 people.
Researchers exploring the legend of Britain’s most famous Knight believe his stronghold of Camelot was built on the site of a recently discovered Roman amphitheatre in Chester.
Legend has it that his Knights would gather before battle at a round table where they would receive instructions from their King.
But rather than it being a piece of furniture, historians believe it would have been a vast wood and stone structure which would have allowed more than 1,000 of his followers to gather.
Historians believe regional noblemen would have sat in the front row of a circular meeting place, with lower ranked subjects on stone benches grouped around the outside.
They claim rather than Camelot being a purpose built castle, it would have been housed in a structure already built and left over by the Romans.
Camelot historian Chris Gidlow said: “The first accounts of the Round Table show that it was nothing like a dining table but was a venue for upwards of 1,000 people at a time.
“We know that one of Arthur’s two main battles was fought at a town referred to as the City of Legions. There were only two places with this title. One was St Albans but the location of the other has remained a mystery.”
The recent discovery of an amphitheatre with an execution stone and wooden memorial to Christian martyrs, has led researchers to conclude that the other location is Chester.
Mr Gidlow said: “In the 6th Century, a monk named Gildas, who wrote the earliest account of Arthur’s life, referred to both the City of Legions and to a martyr’s shrine within it. That is the clincher. The discovery of the shrine within the amphitheatre means that Chester was the site of Arthur’s court and his legendary Round Table.”