The book "История Испании IXXIII веков социальные экономические отношения и политический строй Астуро-Леоно-Кастильского королевства" (History of Spain in the 9th-13th centuries: Socio-Economic Relations and Political System of Asturias and Leon-Castile) by [Author's name] is a comprehensive study of the history of the Iberian Peninsula during the Middle Ages, specifically focusing on the socio-economic relations and political system of Asturias and Leon-Castile in the 9th-13th centuries. The book provides an in-depth analysis of the historical fate of the region and the emergence of feudalism in Spain within the broader context of European development. The author begins by exploring the social, economic, and political factors that shaped the early Middle Ages in the Iberian Peninsula, including the decline of the Roman Empire, the rise of Christianity, and the impact of Islamic invasions.

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