She was a daughter of John of Soissons, Bailiff of Famagusta and his wife, Marie de Milmars.
Margaret and Leo were crowned King and Queen of Armenia on September 14 at Sis.
Leo and his family sent into captivity in Egypt[3] after the Egyptian troops occupied the Armenian capital in 1375.
In August 1377, Leo met with Jean Dardel, a Franciscan who was on his way for a pilgrimage to Jerusalem.
Dardel returned to Europe to plead the case of Leo and his family, and managed to convince King John I of Castile to pay a ransom of precious stones, silks, and birds of prey in 1382.