John II (Breton: Yann; French: Jean; 1239 – 18 November 1305) reigned as Duke of Brittany from 1286 until his death, and was also Earl of Richmond in the Peerage of England.

In 1271, he accompanied Edward to the Ninth Crusade, meeting there with his father and King Louis IX of France.

[3] Upon the death of his father on 8 October 1286, John succeeded him as duke of Brittany, inheriting also the Earldom of Richmond in the Peerage of England.

When the English army sought to recover by plundering the Breton Abbaye Saint-Mathieu de Fine-Terre in 1296, however, John abandoned Edward's cause.

[4] From 1294 until 1304, John assisted the King of France in his campaign against Count Guy of Flanders, taking part in the decisive Battle of Mons-en-Pévèle.