In ancient Iran, a religious event was held to invite ancestors' Fravaši (the spirit or lower-class god, or a spiritual existence that resides in everything and causes all natural phenomena: it is said that this Fravaši also resides in human beings and constitutes the most sacred portion, providing a relationship to connect worship of Fravaši with the worship of ancestors' souls), or in other words, ancestors' souls, and to offer them a memorial service.
古代イランでは、祖先のフラワシ（Fravaši、ゾロアスター教における聖霊・下級神、この世の森羅万象に宿り、あらゆる自然現象を起こす霊的存在、この「フラワシ」は人間にも宿っており、人間に宿る魂のうち、最も神聖な部分が「フラワシ」なのだと言う、ここから、フラワシ信仰が祖霊信仰と結びついた）すなわち「祖霊」を迎え入れて祀る宗教行事が行われていた。