Sassanid Empire

The Sassanid (Sasanian) Empire was the last great pre-Islamic Persian empire and, for more than four centuries, the principal rival of the Roman and later Byzantine empires.

It was founded in 224 CE by Ardashir I, a ruler from the region of Persis who overthrew the Parthian king Artabanus IV and established a more centralised state that consciously presented itself as the heir to the ancient Achaemenid Empire. The Sassanids made Zoroastrianism the state religion, closely linking throne and priesthood, and built an organised administration, a powerful army of armoured cavalry, and impressive cities, the greatest being the capital Ctesiphon in Mesopotamia. At its height under rulers such as Shapur I, who famously captured the Roman emperor Valerian, and later Khosrow I 'Anushirvan,' celebrated for his administrative, legal, and tax reforms and patronage of learning, the empire controlled Mesopotamia, the Iranian plateau, the Caucasus, and extended its influence into Central Asia, Arabia, and toward the Indus. Sassanid Persia was a major centre of culture, science, and art, transmitting and developing knowledge in medicine, astronomy, and philosophy, and its artistic and political traditions deeply influenced both the Islamic world and Byzantium. The empire fought a long series of wars with Rome and Byzantium, culminating in the exhausting conflict under Khosrow II in the early seventh century, which initially saw vast conquests but ended in defeat and internal collapse. Weakened by this war, plague, and dynastic chaos, the empire proved unable to withstand the sudden expansion of the Arab Muslim armies. Its forces were shattered at the battles of al-Qadisiyyah and Nahavand, and the last Sassanid king, Yazdegerd III, was killed in 651 CE, completing the Islamic conquest of Persia.

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