1. Cavendish
Scientist -
http://en.wikipedia.org/wiki/Phoenix_Park_Murd ers
Henry Cavendish, FRS (10 October 1731 - 24 February 1810) was a British scientist noted for his discovery of hydrogen or what he called "inflammable air"
Authority on card games -
http://encyclopedia2.thefreedictionary.com/Cav endish
Cavendish (kăv`əndĭsh), pseud. of Henry Jones, 1831�99, English card game expert
Murdered diplomat -
http://en.wikipedia.org/wiki/Phoenix_Park_Murd ers
On 6 May 1882, the most senior Irish civil servant, the Permanent Undersecretary, Thomas Henry Burke and the newly appointed Chief Secretary for Ireland, Lord Frederick Cavendish � who was also the nephew of Prime Minister William Gladstone � were stabbed to death as they walked though the Phoenix Park in Dublin