According to ancient sources, he remained in office for seventeen years, but Church historian Nikiforos Kallistos mentions that Polycarpus II was the bishop of Byzantium for three years (141–144 AD).
Segundo as fontes antigas, durou no poder dezasete anos, pero o historiador da igrexa Nikiforos Kallistos menciona que Policarpo II foi o bispo de Bizancio durante tres anos (141-144).