Charles Vallancey (1721-1812) was a military surveyor in the British Army eventually holding the rank of general. He was sent to Ireland where he eventually settled. He was also an antiquarian who took great interest in the history, language and mythology of his adopted country. He published a number of book on the subject which have been heavily criticised for both their content and style. He voiced the opinion that the Phoenician and Irish languages were related!(a).
Although Valancey made little reference to Atlantis, James McCulloh noted  that Vallancey was disposed to support John Whitehurst’s association of the Giants Causeway, in Northern Ireland, with Atlantis.