St Adela, another daughter of Dagobert II, became a nun after the death of her husband, Alberic. She is probably the widow Adula, who about 691-692 was living at Nivelles with her little son, the future father of St Gregory of Utrecht. She founded a monastery at Palatiolum, now Pfalzel, near Trier ; she became its first abbess and governed it in holiness for many years. Adela seems to have been among the disciples of St Boniface, and a letter in his correspondence from Abbess Aelffled of Whitby to an Abbess Adola is addressed to her.
Butler’s Lives of the Saints