The Kingdom of Jaén (Spanish: reino de Jaén) was a territorial jurisdiction of the Crown of Castile from the time it was won from Muslim rule in 1246 during the Reconquista until Javier de Burgos' provincial division of Spain in 1833. This was a "kingdom" ("reino") in the second sense given by the Diccionario de la lengua española de la Real Academia Española: the Crown of Castile consisted of several such kingdoms. Know also as the "Santo Reino" ("Holy Kingdom"), its territory coincided roughly with the present-day province of Jaén. Jaén was one of the Four Kingdoms of Andalusia. Its extent is detailed in Respuestas Generales del Catastro de Ensenada (1750-54), which was part of the documentation of a census.

Like the other kingdoms within Spain, the Kingdom of Jaén was abolished by the 1833 territorial division of Spain.

Add N to (X) were a three-piece British band specializing in electronic music performed on analogue synthesizers, formed in London in 1994.

The original band members were Andrew Aveling, Barry Smith (aka Barry 7) and Ann Shenton. Steven Claydon replaced Aveling in 1997.

After several releases on small labels, they turned down offers from major labels and signed to large independent label Mute Records in 1998, and achieved a modest commercial success before splitting in 2003.

Several of their songs and video clips have been adult/sex-related; the video for "Metal Fingers in My Body" is an animated short featuring a woman having sex with a robot, and their video for "Plug Me In" is famous for featuring porn actresses playing with sex toys.

In 1994 Andrew Aveling met Justin Anderson from Freaky Realistic^{[citation needed]} and together they started a band named Radix Couplment^{[citation needed]}. Andrew was dating Ann Shenton at this time^{[citation needed]} and got her involved on the project^{[citation needed]}. Andrew then asked his friend Barry (Former Radio Prague DJ Smith) if he too would be interested in joining^{[citation needed]}. They then spent some time gigging under this name before a fall out which led to Justin's departure from the band. There being only three remaining Andrew then renamed the group Add N to X^{[citation needed]}. They released Vero Electronics (1996) on the Blow Up label, and after did many other recordings for the next album.