Treaty of Guérande (1365)

The first Treaty of Guérande, signed on 12 April 1365, ended the Breton War of Succession.

In this war, two heirs of John III, Duke of Brittany disputed each other's claim to be Duke of Brittany. Joanna de Penthievre and her husband Charles de Blois were supported by the King Charles V of France in the contest against John of Montfort, his son John IV and their English allies. Montfort died during the war after a period of imprisonment. Charles de Blois died in the Battle of Auray in 1364, which decided the war.

While John IV and his English allies won a military victory, this treaty was viewed as a diplomatic victory for the French.

John V won the undisputed right to rule as Duke of Brittany. Joanna de Penthievre transferred her claim to the Duchy of Brittany to Duke John IV, and in return kept most of her remaining lands along with a pension.

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