What was the Macedonian Seleucid Empire and when did it exist?

The Macedonian Seleucid Empire was a Hellenistic state that existed from 312 BC to 63 BC, founded by Seleucus I Nicator, one of the generals of Alexander the Great. It was named after Seleucus and his father Antiochus. It was one of the successor states to Alexander's empire, which was divided among his generals after his death in 323 BC. The Seleucid Empire stretched from the Mediterranean to the Hindu Kush and covered parts of modern-day Iran, Iraq, Syria, Lebanon, Israel, Turkey, and Central Asia.

The empire was characterized by a fusion of Greek and Middle Eastern cultures. Greek became the language of government and commerce, while local languages and customs were tolerated. The Seleucids promoted trade and commerce, built roads and infrastructure, and encouraged the growth of cities.

The Seleucid Empire was beset by external and internal pressures throughout its existence. It faced threats from neighboring empires such as the Parthians, the Bactrians, and the Romans. It also experienced internal strife and power struggles between the ruling dynasty and regional governors.

The Seleucid Empire finally fell to the Romans in 63 BC, after a series of wars and political crises weakened the state. The Seleucid Empire had a lasting impact on the region, contributing to the spread of Hellenistic culture, the growth of cities, and the development of trade and commerce.