The Club of Thirteen or Wednesday Society was a Radical intellectual club in London founded by David Williams in the 1770s.
Resembling the Birmingham Lunar Society, its members included Benjamin Franklin, Richard Lovell Edgeworth, Josiah Wedgwood, Robert Owen, William Hodgson, and Thomas Day. It met at Old Slaughter's Coffee House on St Martin's Lane, or at the "Swan" at Westminster Bridge.
References
Club of Thirteen Wikipedia(Text) CC BY-SA