The Persian Empire is any of a series of imperial dynasties centered in Persia (now Iran and Afghanistan) with boundaries that ebbed and flowed from that core. The first of these was established over 2,500 years ago, in 550 BC, but the existence of dynastic rule centered in the region was absent for an 850 year period, from 651 AD until 1501 AD.
Dynasties that have been counted as instances of the Persian Empire include:
- Achaemenid Empire (550–330 BC), also called "First Persian Empire"
- Parthian Empire (247 BC–224 AD), also called "Arsacid Empire"
- Sasanian Empire (224–651 AD), also called "Neo-Persian Empire" and "Second Persian Empire"
- History of Iran under:
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