45BC – Julius Caesar defeated the Pompeian forces of Titus Labienus and Pompey the Younger on the 17th March 45BC, in the Battle of Munda, his last victory.
1861 – The Kingdom of Italy (1861–1946) was proclaimed on the 17th March 1861.
1941 – The National Gallery of Art In Washington, D.C. was officially opened by President Franklin D. Roosevelt on the 17th March 1941.