Among the various locations proposed for this alternative capital, Constantine appears to have toyed earlier with Serdica (present-day Sofia), as he was reported saying that "Serdica is my Rome".
Di antara beragam lokasi yang dikemukakan sebagai ibu kota alternatif tersebut, sepertinya Konstantinus telah memikirkan mengenai Serdica (sekarang Sofia), sebab ia dilaporkan mengatakan bahwa "Serdica adalah Romaku".