Rabbi Yohanan ben Nappaha
When either the Mishna or Talmud refer to Rabbi Yohanan, it intends Rabbi Yohanan ben Nappaha.
Rabbi Yohanan was among the leading scholars of his era, the first three quarters of the third century. His career began in Sephoris (Tzipori) and later he relocated with the Sanhedrin when it was exiled to Tiberius. Living at this transitional time he is cited in both Mishna and Talmud, and he is considered a Palestinian amora.
Aside from his depth of knowledge, Rabbi Yohanan was also famous for his good looks, which he felt duty bound to share. His greatest student and friend was his protege/brother in law, Reish Lakish.