Apushatayid aishes etc.:
tos’fos horosh writes that there were two different people referred to as yeishu hanotzri (which only means that his name was yehoshua and he came from nazareth). the first was a talmid of R’ Yehoshua ben P’rachya. he got insulted and therefore served an idol, as detailed in the gemora. the second was many generations later, and he practiced black magic and sorcery, and tried to missionize among the lower class of Jews. he is discussed in chesronos hashas on sanhedrin.