Immortals (Persian elite troops)

The Immortals were an elite unit of Persian soldiers known for their discipline, skill, and loyalty. Serving as the king’s most trusted troops, they numbered exactly 10,000, a number that symbolized their perpetual readiness—when one was killed or injured, they were immediately replaced to maintain their full strength. They played a crucial role in key battles like Marathon and Thermopylae, showcasing their formidable reputation. As an integral part of the Persian Empire’s military, the Immortals exemplified both the power and organization of Persian conquest efforts.