In astrology, the royal stars of Persia are Aldebaran, Regulus, Antares and Fomalhaut. They were regarded as the guardians of the sky during the time of the Persian Empire (550 BCE–330 BCE) in the area of modern-day Iran.[1] The Persians believed that the sky was divided into four districts with each district being guarded by one of the four Royal Stars.[2] The stars were believed to hold both good and evil power and the Persians looked upon them for guidance in scientific calculations of the sky, such as the calendar and lunar/solar cycles, and for predictions.
The royal stars are mentioned in the Bundahishn, a collection of Zoroastrian cosmogony and cosmology.