What number pope was St. Athanasius?

St. Athanasius was not a pope; he was a prominent early Christian theologian and bishop of Alexandria, serving from 328 to 373 AD. He is best known for his defense of Trinitarianism against Arianism and for his role in the Council of Nicaea in 325 AD. Athanasius is recognized as a Doctor of the Church and is venerated as a saint in both the Catholic and Orthodox traditions.