In Germany, the Holocaust is a historical fact. Denying the Holocaust is a crime and so we are introduced to an interesting situation:

Deutsche Welle,
23 Feb 2006,
Iranian President Faces Holocaust Denial Charges in Germany

A joint team of Israeli and German lawyers has filed a criminal indictment against the Iranian president in Germany, requesting he be tried for Holocaust denial.

Iranian President Mahmoud Ahmadinejad isn't exactly known for his tact. From calls to "wipe Israel off the map" to claims that the well-document German genocide against Jews known as the Holocaust was a "myth," he has managed to alienate leaders across the globe.
[...]
"The charges are based on German law from 1993 against racial hatred and Holocaust denial," Shahar told DW-RADIO.

Shahar, who heads up the suit, filed the indictment on behalf of the Civil Coalition, which he describes as "an NGO active in Israel and the world, dealing with human rights internally and externally."

Although Ahmadinejad has not publicly denied the Holocaust on German soil, Shahar argues in his indictment that there are firm legal grounds for bringing charges in Germany, where denial of the Holocaust is a crime punishable with up to five years in prison.