In this controversial and revisionist historical work, Spanish historian Ignacio Olagüe presents a radical thesis challenging the traditional narrative of the Muslim conquest of Spain. He argues that the events of 711 were not a foreign military invasion but an internal civil and ideological revolution within the Visigothic kingdom. Olagüe posits that a significant portion of the population, adhering to Arianism, gradually adopted Islamic beliefs in a process he terms the 'Islamic Revolution in the West,' viewing it as a religious schism rather than a violent subjugation by external Arab forces.