The area of Arnedo has been inhabited as early as the Neolithic Age. In pre-Roman times it was known as Sadacia or Sidacia, while the current name derives from the Latin Arenetum ("Place of sand"); the Romans, who arrived here in the 2nd century BC replacing the Celtiberians, built here a fortification to defend the hill, which commanded an important communication hub. Of the Visigothic Age are remains of a 6th-century cave-church.
The Moors conquered Arnedo in the 8th century AD and made it the capital of one of the 26 provinces in which they divided Iberia. The town was conquered by the Christian king Sancho I of Pamplona in 908-909.
On 5 January, 1932, there was a clash between the Guardia Civil and a group of striking workers. The police fired into the crowd killing 11 people and wounding another 30.[2]
^Casanova, Julián (2007). Josep Fontana; Ramón Villares (eds.). Historia de España (in Spanish). Vol. 8: República y Guerra Civil. Crítica/Marcial Pons. pp. 58–62. ISBN978-84-8432-878-0.
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