In 307, Constantine allied to the Italian "augusti", and this alliance was sealed with the marriage of Constantine to Maximian's daughter Fausta. This marriage has caused modern historians to question his relationship to Minervina and Crispus. If Minervina were his legitimate wife, Constantine would have needed to secure a divorce before marrying Fausta, which would have required an official written order signed by Constantine himself, but no such order is mentioned by contemporary sources. This silence in the sources has led many historians to conclude that the relationship between Constantine and Minervina was informal and to assume her to have been an unofficial lover. However, Minervina might have already been dead by 307. A widowed Constantine would need no divorce.