The Swan Tavern is mentioned briefly in the Inkwell and the Dagger in the Lost Stories. It is located in the local village in Highcliff Fief near Castle Highcliff and is known to be opposite the inn which Maeve is in charge of.
The Swan Tavern is the place where Castle Highcliff's seneschal, Philip used to gamble but stopped when he ran up debts with another player. A man by the name of Ambrose who also happens to be a wealthy merchant.