No contemporary source states which of Brankovi*'s five children were also Irene's, although the youngest, Catherine, bore the name of Kantakouzenos, and Mara was ``clearly'' the daughter of one of Brankovi*'s earlier wives. Based on portraits of Irene with *ura* Brankovi* and his five children from a chrysobull preserved at the monastery of Esphigmenou on Mount Athos, dated 11 September 1429, Nicol interprets how the individuals were grouped that Stefan and Lazar were her children too.
Irene
Nicol