Alexander the Great
In 340 BC, Philip assembled a large Greek army and invaded Thrace. He left 16 year old Alexander with the power to rule Greece in his absence as regent. But as the Macedonian army advanced deep into Thrace, the Thracian tribe of Maedi bordering north-eastern Macedonia rebelled and posed a danger to the country. Alexander assembled an army, led it against the rebels, and with swift action defeated the Maedi, captured their stronghold, and renamed it Alexandroupolis.