Possible Duplicate: Bmei Matisyahu ben Yochnan Kohen Godol בימי מתתיהו בן יוחנן כהן גדול - In the days of Matisyahu ben Yochanan Kohain Gadol --"Al Hanisim" prayer said on Chanuka Who ...
In "Al Hanisim" we say "Bimei Matisyahu ben Yochanan Kohen Godol", "in the days of Matisyahu the son of Yochanan the Kohen Gadol (=high priest)". Who was the Kohen Godol: Matisyahu or Yochnan?
In Al Hanissim we mention a Yochanan Kohen Gadol. Since there were several kohanim gedolim named Yochanan which one is this, historically?