Matilda of Požega (born c. 1210 - died after 1255) was daughter of Margaret of Courtenay (d. 1270), princess of the Latin Empire of Constantinople, from her first marriage with Raoul III, Lord of Issoudun. Matilda was married (c. 1230) to John Angelos, Lord of Syrmia (d. before 1250) in the Kingdom of Hungary. After his death, she held the city of Požega in the medieval Požega County (c. 1250-1255).
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Parents
Matilda's mother Margaret was daughter of Peter Courtenay (d. 1219), Latin Emperor of Constantinople, and his second wife Yolanda of Flanders. Margaret′s brothers, consequent Latin emperors Robert I (d. 1228) and Baldwin II (d. 1273), were Matilda′s maternal uncles.
Regarding her father, some earlier researches assumed that she was born from her mothers second marriage, with Henry I, Count of Vianden (d. 1252), but later scholars pointed out that Margaret's first husband Raoul III of Issoudun did mention their "little daughter" (lat. filiola) Matilda in his 1212 testament, and thus was shown that she was born from Margaret's first marriage.
Marriage and descendants
Since Matilda's mother Margaret was sister to Yolanda, Queen of Hungary (d. 1233), a marriage was arranged (c. 1230) between Matilda and John Angelos, son of Yolanda's sister-in-law Margaret of Hungary from her first husband, Byzantine Emperor Isaac II Angelos (d. 1204). Matilda's husband John became Lord of Syrmia in the medieval Kingdom of Hungary, and after his death (before 1250), Matilda became the Lady of Požega in medieval Požega County (central region in modern Slavonia). Already in 1250, she was mentioned as "noble lady, widow of lord John, countess of Požega" (lat. nobilis domine relicte domini Johannis, comitisse de Posoga).
Their daughter Maria was married (c. 1253-1255) to Anselm de Cayeux, who later (before 1269) became camerlengo of the Latin Emperor Baldwin II of Constantinople, Matilda′s uncle. Various issues regarding the attribution of data related to two persons (father and son) who had the same name (Anselm de Cayeux), have been discussed in several genealogical studies, since some napolitan and ragusan sources from the 1280s suggest that Matilda′s daughter Maria had a sister (lat. soror), or at least a half-sister Helen, Queen of Serbia (d. 1314). If some of those assumptions are correct, Matilda would be Helen's mother too, and thus the maternal grandmother of Serbian kings Stefan Dragutin (d. 1316) and Stefan Milutin (d. 1321).