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The Persian Immortals are highly-trained and skilled swordsmen that are excellent attackers in the ancient era. They replace the Swordsman.
A Persian city must have iron in its Strategic Resource box to build Immortals.
Civilopedia Entry
The Immortals were a strong corps of heavy infantry deployed by the Persian Empire in the fifth century BC. Gifted soldiers, they drew their moniker from the fact that regardless of the casualties sustained in battle, the unit was restored to full strength, no matter the cost. Equipped with bow and spear, the front rank would advance upon the enemy while rear ranks rained arrows to ease the assault.