Constantine wrote the letter from Nicomedia, so some have concluded that Eusebius of Nicomedia, the bishop of Nicomedia and a supporter of Arius, may have been involved in the composition of the letter.
Konstantin je to pismo napisao iz Nikomedije, pa su neki zaključili da je Euzebije, biskup Nikomedije i pristaša Arija, možda sudjelovao u sastavljanju pisma.