[2][4] Under the Achaemenid Empire (330–550 BC), the Armenian subjects of the Persian king gave him 20,000 horses every year during the celebration of Mehregan.

[5] Due to these two festivals being heavily connected with the role of Iranian kingship, the Sasanian rulers were usually crowned on either Mehregan or Nowruz.

"[7] As Biruni also does for the other festival days he mentions, he reiterates a local anecdotal association for his description of Mehrgan (ha al-mirjan in the author's Arabic parlance) with a fragment of a tale from Iranian folklore: On this day, Fereydun vanquished the evil Zahhak and confined him to Mount Damavand.

Visitors from different parts of the Persian Empire brought gifts for the king all contributing to a lively festival.

These ceremonies were involved in the provinces of Tehran, Yazd, Kordestan, West Azerbaijan, Zanjan, Sistan and Baluchestan, Isfahan, Bushehr, North Khorasan, and Golestan.

These name-day feasts are festivals celebrated on the day of the year when the day-name and month-name dedicated to a particular angel or virtue intersect.