In Al Hanissim we mention a Yochanan Kohen Gadol. Since there were several kohanim gedolim named Yochanan which one is this, historically?
It's not so straightforward to assume that the Yochanan Kohen Gadol of (Ve')Al Hanissim is the same one who became a Tzeduki. The Vilna Gaon (Imrei Noam to Berachos 29a) distinguishes them (and Josephus' account supports this): the latter was Matisyahu's grandson; the former is obviously, from the wording of the prayer, Matisyahu's father.
There are three options. The famous Yochanan kohein gadol was either the father of Matisyahu, or his son, or his grandson. http://www.torahmusings.com/2006/01/yohanan-high-priest/