Treaty of Montreuil (1299)

The 1299 Treaty of Montreuil (Latin: Tractatus apud Musterolium) or Montreuil-sur-Mer[a] (French: Traité de Montreuil-sur-Mer) was part of the negotiations between King Edward I of England and Philip IV of France during the 1294–1303 Gascon War.

It was drafted at Montreuil on 19 June 1299[1] and ratified by Edward I on 4 July[2] and Philip IV on the Feast of the Invention of St Stephen (3 August).

[3] The treaty was negotiated on Edward I's behalf by Henry de Lacy, the earl of Lincoln; Guy de Beauchamp, the earl of Warwick; and Amadeus V, count of Savoy.

[4] It was said by contemporaries that the alliance brought "great unhappiness to both parties".

Following the prince's accession as Edward II in 1307, the two married at Boulogne-sur-Mer on 25 January 1308, when Isabella was 12.

The English Angevin Empire and France after the 1259 Treaty of Paris and 1271 deaths of the Count and Countess of Poitou .
Edward I creating Edward II Prince of Wales (early 14th cent.)
Philip IV and family— Isabella 3rd from left—in a 1313 manuscript illumination