Alfred Stork's conviction was the first in Italy for the Kefalonia massacres in which thousands of Italian soldiers were killed in September 1943.
Previous attempts at prosecution were closed because the defendants had died or those responsible could not be properly identified, said military prosecutor Marco De Paolis.
Stork, who now lives in Germany, was tried as a member of an execution squad that killed the 120 Italian officers, including division commander Gen. Antonio Gardin, on Sept 23, 1943, De Paolis said.
"There were numerous massacres in those five or seven days, all over the island. Some were killed fighting, others were shot down, some were arrested and killed after being held for a day," De Paolis said.
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Two German officers were convicted at the Nuremberg trials of the Kefalonia massacres, along with other war crimes, and sentenced from 12 to 20 years. Other prosecution attempts in Germany and Italy in the 1950s and 1960s failed.
De Paolis said he felt it was "useless' to petition for Stork's extradition for trial since Germany has refused in the past to turn over its citizens even when convicted of Nazi-era crimes.
Efraim Zuroff, the head Nazi-hunter at the Simon Wiesenthal Center, noted that Italian military courts have in recent years convicted many Germans for wartime massacres but always in absentia due to Germany's refusal to extradite its citizens. Italy as a result has requested in previous cases for those convicted and sentenced to life to serve their time in Germany.