The Royal Guard.

Wish you a beautiful day.
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Darius the Great built the greatest palace at Persepolis on the western side. This palace was called the Apadana (the root name for modern ایوان ayvān).[14] The King of Kings used it for official audiences. The work began in 515 BC. His son Xerxes I completed it 30 years later.
Two Persepolitan style symmetrical stairways were built on the northern and eastern sides of Apadana to compensate for a difference in level. The external front views of the palace were embossed with carvings of the Immortals, the Kings' elite guards.