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Roman Empire
The Roman Empire, at its height (c. 117), was the most extensive political and social structure in western civilization. Building upon the foundation laid by the Roman Republic, the empire became the largest and most powerful political and...

Definition
Western Roman Empire
The Western Roman Empire is the modern-day term for the western half of the Roman Empire after it was divided in two by the emperor Diocletian (r. 284-305 CE) in c. 285/286 CE. The Romans themselves did not use this term. At its height (c...

Definition
Sasanian Empire
The Sasanian Empire (224-651 CE, also given as Sassanian, Sasanid or Sassanid) was the last pre-Islamic Persian empire, established in 224 CE by Ardeshir I, son of Papak, descendant of Sasan. The Empire lasted until 651 CE when it was overthrown...

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The Achaemenid Persian Empire c. 500 BCE
A map illustrating the rise and evolution of the Achaemenid Persian Empire (from the name of Achaemenes, an ancestor of the empire's founder, Cyrus the Great) from its origins in around 550 BCE when Cyrus II of Persia conquered the Medes...

Definition
Cyrus the Great
Cyrus II (d. 530 BCE), also known as Cyrus the Great, was the fourth king of Anshan and the first king of the Achaemenid Empire. Cyrus led several military campaigns against the most powerful kingdoms of the time, including Media, Lydia...

Definition
Ahura Mazda
Ahura Mazda (also known as Ahuramazda, Harzoo, Hormazd, Hourmazd, Hurmuz, Ohrmazd, 'Lord' or 'Spirit') is the highest spirit worshipped in Zoroastrianism, the old Mede and ancient Persian mythology which spread across Asia predating Christianity...

Definition
Cambyses II
Cambyses II (r. 530-522 BCE) was the second king of the Achaemenid Empire. The Greek historian Herodotus portrays Cambyses as a mad king who committed many acts of sacrilege during his stay in Egypt, including the slaying of the sacred Apis...

Definition
Ancient Persian Religion
Ancient Persian religion was a polytheistic faith which corresponds roughly to what is known today as ancient Persian mythology. It first developed in the region known as Greater Iran (the Caucasus, Central Asia, South Asia, and West Asia...

Definition
Artaxerxes I
Artaxerxes I (r. 465-424 BCE) was the sixth monarch of the Achaemenid Persian Empire. He was the son of Xerxes I (r. 486-465 BCE) and his principal wife Amestris (d. 424 BCE) and grandson of Darius I (the Great, r. 522-486 BCE). He continued...

Definition
Empire of Nicaea
The Empire of Nicaea was a successor state to the Byzantine Empire, or rather a Byzantine Empire in exile lasting from 1204 to 1261 CE. The Empire of Nicaea was founded in the aftermath of the sacking of Constantinople during the Fourth Crusade...