No, not Joan!

She did the first Frexit:

Joan of Arc (French: Jeanne d'Arc,^[5] IPA: [ʒan daʁk]; 6 January c. 1412^[6] – 30 May 1431), nicknamed "The Maid of Orléans" (French: La Pucelle d'Orléans), is considered a heroine of France for her role during the Lancastrian phase of the Hundred Years' War and was canonized as a Roman Catholic saint. Joan of Arc was born to Jacques d'Arc and Isabelle Romée, a peasant family, at Domrémy in north-east France. Joan said she received visions of the Archangel Michael, Saint Margaret, and Saint Catherine of Alexandria instructing her to support Charles VII and recover France from English domination late in the Hundred Years' War.

With a litle help from mass religious delusions.   Drudge has her pic:

Here is another: