If you're a big fan of Sun Tzu's style of boiling down complexity into simplicity, I'd also recommend Kautilya. He was a teacher of Chandragupta, the Indian emperor who unified the whole country in the 4th Century BC. He was a more blunt advocate of manipulation and realpolitik than even our Italian friend. Very interesting if you can get a hold of his writings. He's best known for the Arthasastra, a political work similar to The Prince. He has even less pretense of humanity than Machiavelli. Quite entertaining, especially if you like Darth Vader-style political maneuvering.