Josselin (Breton: Josilin) is a commune in the Morbihan department in Brittany in north-western France.
In 1351, during the Breton War of Succession (part of the Hundred Years’ War), two groups of approximately 30 English knights (led by Robert Bramborough, the English captain of Ploërmel) and Franco-Breton knights (commanded by Jean de Beaumanoir, captain of Josselin) staged an arranged combat at a spot halfway between the Chateau de Josselin and Ploërmel. The Franco-Breton side eventually won after killing or capturing the English force, including Bramborough. This episode was later known as the Combat of the Thirty.
The Castle of Josselin can still be seen today, although only four of the original nine towers remain after the Cardinal Richelieu ordered the castle partially demolished in 1629.