In Scandinavian mythology, the Aesir (from Old Icelandic Æsir, ásafólk, ása ættir) were the group of principal gods, associated or related to Odin, and inhabiting the city of Ásgard. They are often referred to under the generic term of guðin "gods". The feminine term is Asynes. They appeared in Scandinavian religion after the Indo-European invasions, and were probably incorporated into the ancient pantheon, instead of supplanting their predecessors, the Vanes. We find traces of this exemplary fusion in the Völuspá, one of the main texts of Norse mythology, where it is said that the Aesir faced the Vani in a war of interest.
The leader of the Ases is Odin, who created the world with his brothers. Their enemies are the giants, with whom they are continually at war. They were also at war with the Vanes, with whom they made peace and exchanged hostages. One of the three roots of the cosmic tree Yggdrasil is found among the Ases. Every day, the Aesir cross the rainbow bridge Bifröst to sit near the source of Urd. At the end of time, during Ragnarök, only a few Aesir will survive to rebuild the worlds. The prologue of the Edda in prose explains the origin of their name by making them men from Asia (from Troy more exactly), whom the peoples of northern Europe took for gods.
It has been suggested that their names would have remained in our common card games, designating the strongest cards of each family, Ases =As, the four Aces of the card game, but the Robert Dictionnaire Historique de la Langue Française indicates, with more of likelihood, that the aces of our decks of cards proceed from the Roman coin, from where comes that they have long been the weakest card