The white grape variety originates from Spain. Synonyms are Aidén, Blanc du Zerhoun, Blancón, Burra Blanca, Colgadera, El Biod, El Biodh, El Karim, Forcallada, Forcallat, Forcallat Blanca, Forcallat Blanco, Forcellat Bianca, Laeren de Rey, Manchega, Mantuo Laeren, Valdepeñera Blanca, Valdepeñas and Zerhouni. The exact origin is the area of Cuenca in the region of Castilla-La Mancha, where it is known as Manchega. It should not be confused with the Forcallat Blanca or Lairén varieties because of apparent synonyms or morphological similarities. The close relationship between Airén, Clairette and Roditis established by analyses carried out in Italy in 1999 is doubted by the Swiss biologist Dr José Vouillamoz. According to DNA analyses last carried out in 2018, Airén is a direct descendant of Hebén; the second parent is unknown. The variety Parreira Matias was created by a presumably natural cross with Alfrocheiro.