Aisenfield (アイセン平原, Aisen-heigen?) is a recurring location in the Ivalice series of games. It is described as a plain with a particular legend surrounding the Hero Gaol and the Thirteen Knights of Aisen.
This grassy plain was where Marche Radiuju came to investigate the rumor of a mysterious "diamond rain". A castle once stood guarded by the Aisen 13, one of whom was the Hero Gaol.
The legend of Gaol and the Thirteen Knights of Aisen is invoked again in this grassy plain leading to five highroads of Jylland's Ordalia.