The mythical ruler's legendary court has been associated with locations throughout Wales, including Carmarthen, St David's, and Cardigan.
Now a retired Bangor University professor has revealed what he believes to be the true location of Camelot.
And it turns out to be a small Roman fort at Slack, on the outskirts of Huddersfield in West Yorkshire.
Prof Peter Field, a renowned expert in Arthurian literature, said:  "It was quite by chance. I was looking at some maps, and suddenly all the ducks lined up.
"I believe I may have solved a 1,400-year-old mystery."
Previous best guesses for the location of the round table include Caerleon in Newport, Somerset's Cadbury Castle, and Tintagel in Cornwall.
In Roman times, Slack was home to a fort called Camulodunum, which means "the fort of the god Camul".
Over the years, well-recognised linguistic processes would have reduced Camulodunum to Camelot.
Though almost forgotten and insignificant today, and even though it was abandoned and dilapidated by the relevant time of King Arthur around A.D. 500, Prof Field argues that this site at Slack would still have been considered a strategic stronghold.
At that time, Celtic-speaking Britons, who could have been led by King Arthur, held the north and the west coast against the invading Anglo-Saxons.
Slack, on the Roman road from Chester to York, would have been the ideal location from which to defend the east coast.
Prof Field added: "If there was a real King Arthur, he will have lived around AD500, although the first mention of him in Camelot is in a French poem from the Champagne region of France from 1180.
"There is no mention of Camelot in the period between those dates, known as the Dark Ages, when the country was at war, and very little was recorded.
"In this gap, people passed on information, much got lost in transmission, and people may have made up facts or just messed up known information."
Prof Field, who taught at Bangor from 1964 to 2004, has been researching the location of Camelot for the past 18 months.
He spoke about his findings during the official launch of Bangor University's Stephen Colclough centre for the history and culture of the book.

A senior Chinese foreign ministry official is quoted as saying that the Zambian authorities have failed to provide strong evidence.
Those arrested are accused of, among other things, running unlicensed smelting plants and employing children.
China has invested heavily in Zambian copper mining and other sectors.
The country is also home to a growing Chinese community.
The arrests happened in a joint police and immigration operation in the town of Chingola, 400km (250 miles) north of the capital, Lusaka.
"We are here to put to an end this criminality. Foreign investors who come into this country must work within the confines of the law. Those who break the law will be flushed out," Home Affairs Minister Stephen Kampyongo was quoted as saying in the Times of Zambia.
Lin Songtian, the Chinese Foreign Ministry's director-general for African affairs, said that while he supports measures to deal with illegal mining, in this case proof had not been provided, Reuters news agency reports.
He also complained that among those arrested was a pregnant woman and two others with malaria.
There has been some tension between the Chinese and Zambians in the past.
In 2010, two Chinese managers were accused of attempted murder after firing on miners during a pay dispute. The charges were later dropped.
Two years later, Zambian miners killed a Chinese manager during a riot at a coal mine.
The quest to find King Arthur's Camelot has puzzled and intrigued scholars and fans for over a thousand years.
[NEXT_CONCEPT]
China has complained to Zambia after 31 of its nationals were arrested at the weekend for alleged illegal mining practices.