Bbc.co
Pythagoras was an influential greek mathematician and philosopher, best known for the theory to which he gave his name.
http://www.bbc.co.uk/history/historic_figures/pythagoras.shtml
Ilexikon
Ilexikon
http://www.ilexikon.com/Samos.html
Mlahanas
Mlahanas
http://www.mlahanas.de/Greeks/Eupalinos.htm