[3][4] Eusebia's commemoration is on 16 March; Adalsinda's feast day is 25 December, around the date of her death, by tradition "during the solemnities of Christmas".
[5] Following their father's death in an attack, near Périgueux, c. 652, the sisters' mother, Richtrudis, retired to the Marchiennes Abbey that she and her husband had founded in 630.
As Marchiennes had been made a dual monastery by Richtrudis around 647, her son Maurontius, once he became a monk, was also at the same abbey for a time.
[8] Saint Adalsinda[a] (French: Adalsinde),[9] the youngest child of the family, entered Marchiennes Abbey in c. 653, with her mother and sisters.
[10][5] Writing in 2007, Dries van den Akker, a Jesuit author and editor stated, "more recent sources, which are based on historical research, give the year 715 as her date of death".
According to Dunbar's 1904 Dictionary of Saintly Women, Queen Nanthild was Eusebia's godmother and had gifted her with the fine estate of Verny near Soissons.
[7][14][15] Before her death, Gertrude named Eusebia her successor and she was duly elected abbess upon her great-grandmother's demise.