County town of Lincolnshire, England.
Known as Lindum to the Romans, Lincoln had a flourishing wool trade in medieval times. Paulinus built a church in Lincoln in the seventh century, and the eleventh-fifteenth-century cathedral has the earliest Gothic work in Britain. The twelfth-century High Bridge in the High Street is the oldest in Britain still to have buildings on it.
As to Arthurian connections, Lincoln is cited as the birthplace of Andred, Tristan's cousin and a resident at Mark's court. It is also used as a surname for Tom a'Lincoln ('Tom of Lincoln'), the Red Rose Knight, the illegitimate son of Arthur and Angelica.
However, Lincoln is possibly best known in connection with Cat Coit Celidon, a wood slightly to the north of the city that is cited by Nennius as the location of one of Arthur's battles, at which Arthur and Hoel defeated the Saxon hordes. It is possible that this battle is cognate with the Battle of Caledon Wood.