Former Slave Merlin
Hiya! I'm looking for a fic about Merlin being a former slave. He and the Round Table knights and Arthur are out hunting or relaxing and Merlin is caught by two men from Cenred's kingdom. Arthur buys Merlin from them for 20 gold and Merlin reveals he was slave for about seven years (he escaped a few months before coming to Camelot). At the end, Merlin covered the tattoo (on the small of his back) with a tattoo of the Pendragon crest upon a suggestion from Lancelot.