From this bibliography, it can be observed that two types of Airén (Lairén or Layrén) are described: one is the variety extensively grown in La Mancha and which is cited in the first reference by Clemente, by Abela, by García de los Salmones, by Marcilla, by Hidalgo, by Jancis Robinson, and by Peñín. The second type of Airén (Layrén or Datileña) is a table grape used to produce raisins and which is described by Alonso de Herrera, in the second reference by Clemente, and by Fernández de Bobadilla. The first mention of the name Airén (currently the most widely used denomination to define this variety) is in the citation by García de los Salmones (1914) in the province of Albacete.