Europe and Russia, mostly.
During which time period has this been going on?
Since the idea of Jewish blood libel began, through the Crusades, and on past the end of WW2. Vatican 2 officially renounced the idea of Jewish blood libel.
I have heard no stories of Christians having "terrorized" Jews during at least the past century if not longer.
You haven't?
No, I have not read or heard anything anywhere that suggests Christians are terrorizing Jews. I've read and heard of Islamic facists, Arabs, and Muslims having terrorized Jews.
Apion was an Egyptian.
http://www.jewishencyclopedia.com/view.jsp?artid=1641&letter=A