Cosmas II of Naples

Cosmas II was bishop of Naples in Italy from 746 or 747 to 748 or 749, venerated as a saint before the separation of the Churches. He is venerated in the Catholic Church and commemorated on 16 August. His veneration is local, at Naples.

The main source about him is the first part of the Deeds of the Bishops of Naples, written at the turn of the eighth and ninth centuries by an unknown author. No reports have survived of his family and the years of his youth. He ascended the episcopal throne of Naples after the death of Sergius I, in 746. His candidacy was proposed by Pope Zachary and approved by the Byzantine emperor Constantine V. It is supposed that the enthronement of the new pastor could have taken place in 747.

Cosmas II governed the diocese for only two years, two months and six days. His death is placed in 748 or 749. His successor on the episcopal throne was Saint Calvus.

Soon after his death Cosmas II came to be venerated by the Neapolitans as a saint. Proof of this is the mention of his name in a martyrology of the ninth century, whose author used still earlier church sources.