October 16
1590 – Carlo Gesualdo, composer, Prince of Venosa and Count of Conza, murders his wife, Donna Maria d’Avalos, and her lover Fabrizio Carafa, the Duke of Andria at the Palazzo San Severo in Naples. 1843 – Sir William Rowan Hamilton comes up with the idea of quaternions, a non-commutative extension of complex numbers. 1847 –...