Parthia was an ancient empire located in what is now modern-day Iran and parts of Central Asia. It was a major power in the region from the 3rd century BC to the 3rd century AD.
The Parthian Empire was known for its strong cavalry and was a significant rival to the Roman Empire.
The Magi, or Magians, were a group of priests in the Parthian Empire who were often associated with Zoroastrianism, an ancient Persian religion. These priests were known for their knowledge of astrology and divination, which led them to be consulted by kings and other rulers for guidance and advice.
The Magi visited King Herod to inquire about the birth of a new king, whom they believed would be the "King of the Jews." Herod, fearing a potential threat to his rule, ordered the Magi to report back to him after finding the child, so he could also pay homage to the newborn king. However, the Magi were warned in a dream not to return to Herod, and they did not report back to him.
Herod's fear of the Magi stemmed from the fact that they were powerful and influential figures in their own right, who were capable of stirring up unrest or rebellion among the people.
The Parthian Empire was a significant threat to the Roman Empire, and any alliance between the Magi and Parthia could have posed a serious challenge to Herod's rule. Therefore, Herod had good reason to fear the influence of the Parthian Priests, or Magi, on his kingdom.