Heraclea Perinthus was an ancient Greek city located on the coast of the Propontis (modern-day Sea of Marmara) in Thrace, near the modern city of Marmara Ereğlisi in Turkey. It was founded in the 7th century BC by colonists from Megara and was an important port city in the region. The city was destroyed by the Persian king Xerxes in 479 BC, but was later rebuilt by Alexander the Great in the 4th century BC. The city was an important center of trade and commerce, and was home to many temples, including a temple of Apollo. It was also an important military center, and was the site of several battles during the Peloponnesian War. Archaeological excavations have revealed a number of artifacts from the city, including pottery, coins, jewelry, and statues. Excavations have also revealed the remains of a large theater and a number of public baths. In addition, the remains of a large fortification wall have been found, as well as a number of tombs and burial sites.