Maria Fadrique (1370 – c. 1394) was Lady regnant of the Lordship of Salona in Frankish Greece from 1382 until its conquest by the Ottoman Empire in 1394 under the regency of her mother Helena Asanina Kantakouzene.
[1] When Helena was threatened by the alliance of her cousin Theodore I Palaiologos, Despot of the Morea, and Nerio I Acciaioli, Duke of Athens, she sought the help of Stephen of Pharsalos, the younger son of Simeon Uroš, Despot of Epirus.
In April 1388, King John I of Aragon offered her the rights of castellan over Athens on the condition she would defend the city.
This arrangement came close to being consummated with a marriage, for King Peter IV of Aragon wrote to Helena on 17 August 1386 and reproached her for marrying her daughter to a foreigner.
Nerio Acciaioli is said to have sought her hand for his brother-in-law Pietro Saraceno, but in 1390 arrangements appear to have been made for Maria to marry Matthew of Moncada, son of William Raymond of Montcada, Count of Augusta.