October 17
1091 – London tornado of 1091: A tornado thought to be of strength T8/F4 strikes the heart of London. 1558 – Poczta Polska, the Polish postal service, is founded. 1604 – Kepler’s Supernova: German astronomer Johannes Kepler observes a supernova in the constellation Ophiuchus. 1610 – French King Louis XIII is crowned in Reims Cathedral....