The Treaty of Melun was signed in April 1226 between Louis VIII of France and Joan, Countess of Flanders. Joan was forced into accepting the accord since her husband, Ferdinand, prince of Portugal, Ferrand of Portugal, was captured by the French at Bouvines on 27 July 1214. Based on the terms of the treaty, Ferrand and Joan were forced to swear their loyalty to Louis. Consequently, Flemish nobles, knights, and burghers had to take oaths of loyalty to the King of France, which included the understanding not to support the Count of Flanders if he were to betray the King. Also, no new castles were to be erected below the Scheldt. Lastly, Jeanne was forced to pay 50,000 livres in order to have her husband released from prison.

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* * * *{{cite journal , journal=The Journal of Medieval Military History , editor-first1=Bernard S. , editor-last1=Bachrach , editor-first2=Clifford J. , editor-last2=Rogers , editor-first3=Kelly , editor-last3=DeVries , volume=II , publisher=The Boydell Press , year=2004 , title=Military Service in the County of Flanders , first=J.F. , last=Verbruggen , translator-first=Kelly , translator-last=DeVries 1226 in Europe 1220s in France 1220s treaties, Melun Treaties of the Kingdom of France, Melun