On this day – 18th May

1302   The weaver Peter de Coningk led a massacre of the Flemish oligarchs.

1652   In Rhode Island, a law was passed that made slavery illegal in North America. It was the first law of its kind.
1804   Napoleon Bonaparte was proclaimed emperor by the French Senate.
1944   Monte Cassino, Europe’s oldest Monastic house, was finally captured by the Allies in Italy.
1974   India became the sixth nation to explode an atomic bomb.