Maria was born after 1363 to Guy of Enghien, Lord of Argos and Nauplia, and Bonne de Foucherolles.
[1][2] Being her parents' only child, she was the heiress apparent to her father's lordship when she was engaged to Joan de Lluria, the Catalan lord of Stiris in the Duchy of Athens in 1371.
[4] For instance, they jointly confirmed Louis of Enghien's previous land grant to a local nobleman.
[6][7] Both Argos and Nauplia were located at strategically important places and the Senate accepted the offer.
[7] On 12 December 1388, Maria sold her lordship in return for an annual income payable to her and her descendants as long as Venice held Argos and Nauplia.