1941 December 7 - 9, RIGA (Russia)
Within two days 80% of the Jews living in the ghetto (25,000 people) were shot including the famous historian Simon Dubnow. On December 8, at age 81, Dubnow was shot by a former student of his, now a Gestapo officer.
His dying message to fellow Jews was: "Yidn, shreibt un farshreibt!" ("Jews, write and record!").