Alexander the Great listening to the Oracular tree at the end of the world. The legend says that the king arrives at the end of the world, where he encounters a tree with male and female heads. The talking tree, shown here with both human and animal heads, warns the king of his imminent death in a foreign land. Alexander III of Macedon (356-323 BC) was a Greek king. In 334 BC, he invaded Persian-ruled Asia Minor and began a series of campaigns that lasted ten years. Alexander broke the power of Persia in a series of decisive battles, overthrew the Persian King Darius III and conquered the entirety of the Persian Empire. He was undefeated in battle and is considered one of history's most successful commanders. His campaigns greatly increased contacts and trade between East and West, and vast areas to the east were significantly exposed to Greek civilization and influence. In June 323 BC, Alexander died a painful death in the palace of Nebuchadnezzar II, at age 33.