Vigilantia and her brother, Justinian I, were children of Petrus Sabbatius and a senior Vigilantia, who was a sister of Justin I. Justinian I had several nephews but seems to have never appointed an heir.
Vigilantia dan saudaranya, Yustinianus I, adalah keturunan Petrus Sabbatius dan senior Vigilantia, yang merupakan saudari Yustinus I. Yustinianus I memiliki beberapa keponakan tetapi tampaknya tidak pernah menunjuk ahli waris.