Sadé or Sada is the most important Iranian winter festival.  Sada also is a celebration to honor fire and to defeat the forces of darkness and cold.

Some of Iranians believe that the festival dates back to the time of Houshang, the first Kianid king who discovered how to light a fire.

Sade is a non-religious festivity and until the Iranian Revolution of 1979, Iranians openly and freely celebrated it in Iran.  However, at this time only Zorostarians are allowed to celebrate it freely.