Philip II of Macedon

In October 336 BC, King Philip II of Macedon was assassinated during a royal wedding at Aegae by his bodyguard, Pausanias of Orestis. The murder immediately elevated his twenty-year-old son, Alexander III, to the Macedonian throne. Rather than fracturing the northern kingdom as neighboring rivals anticipated, Philip's sudden death unleashed Alexander the Great. Alexander swiftly executed potential rivals, secured Greece, and launched the massive campaign against the Persian Empire that his father had planned and financed. Within a decade, Alexander conquered territories stretching to India, fundamentally reshaping Eurasian trade, urban architecture, and military doctrine while initiating the Hellenistic era.