WORLD CIVILIZATION

Detailed explanation-1: -Immortals (Ancient Greek: , romanized: Athánatoi) or Persian Immortals was the name given by Herodotus to an elite heavy infantry unit of 10, 000 soldiers in the army of the Achaemenid Empire.

Detailed explanation-2: -The Sasanian Empire, which occupied much of the same territory as the Achaemenids, created its own elite force of 10, 000 Persian warriors by the 5th Century CE. Roman chroniclers called them the Immortals. Like their predecessors, these Immortals were a professional fighting force of well-trained and equipped soldiers.

Detailed explanation-3: -The Ten Thousand Immortals were the elite force of the Persian army of the Achaemenid Empire (c. 550-330 BCE). They formed the king’s personal bodyguard and were also considered the shock troops of the infantry in Persian warfare. They are among the most famous fighting forces of the ancient world.