Mehregan

Mehregan or Jashn-e Mehr ( lit.  Mithra Festival) is a Zoroastrian and Iranian festival celebrated to honor the yazata Mithra, which is responsible for friendship, affection and love.

Name
"Mehregan" is derived from the Middle Persian name Mihrakān/Mihragān, itself derived from Old Persian Mithrakāna.

Introduction
Mehregan is an Iranian festival honoring the Zoroastrian yazata (angelic divinity) Mithra. 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. Under the Sasanian Empire (224–651), Mehregan was the second most important festival, falling behind Nowruz. 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.

In al-Biruni's eleventh-century Book of Instructions in the Elements of the Art of Astrology (233), the astronomer observed that "some people have given the preference to Mihragān [over Nowruz, i.e. New Year's day/Spring Equinox] by as much as they prefer autumn to spring."

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. This fragment of the legend is part of a greater cycle that ties Mehrgan with Nowruz; Dahak vanquished Jamshid (who the legends have as the one establishing Nowruz or New Year's Day), and Fereydun vanquishes Zahhak, so restoring the balance. The association of Mehrgan with the polarity of spring/autumn, sowing/harvest and the birth/rebirth cycle did not escape Biruni either, for as he noted, "they consider Mihragān as a sign of resurrection and the end of the world, because at Mihragān that which grows reaches perfection."

In ancient times
Mehrgān was celebrated in an extravagant style at Persepolis. Not only was it the time for harvest, but it was also the time when the taxes were collected. Visitors from different parts of the Persian Empire brought gifts for the king all contributing to a lively festival.

During pre-Islamic and early Islamic Iran, Mehrgān was celebrated with the same magnificence and pageantry as Nowruz. It was customary for people to send or give their king, and each other, gifts. Rich people usually gave gold and silver coins, heroes and warriors gave horses while others gave gifts according to their financial power and ability, even as simple as an apple. Those fortunate enough would help the poor with gifts.

Gifts to the royal court of over ten thousand gold coins were registered. If the gift-giver needed money at a later time, the court would then return twice the gift amount. Kings gave two audiences a year: one audience at Nowruz and other at Mehregān. During the Mehregān celebrations, the king wore a fur robe and gave away all his summer clothes.

After the Mongol invasion of Iran, the feast celebration of Mehrgān lost its popularity. Zoroastrians of Yazd and Kermān continued to celebrate Mehrgān in an extravagant way.

In the present-day
On October 2, 2022, which coincided with Mehregan, there were series of ceremonies conducted across Iran. These ceremonies were involved in the provinces of Tehran, Yazd, Kordestan, West Azerbaijan, Zanjan, Sistan and Baluchestan, Isfahan, Bushehr, North Khorasan, and Golestan.

Basis for the date
As noted above, Mehrgān is a name-day feast. 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. Indeed, Zoroastrian Persians before Islam had 30-days months, which means that each day in a month had a different name, with 12 of the days also being names of the 12 months. The day whose name corresponded to the name of the month was celebrated.