Córdoba (Arabic: قرطبة [Qurtuba], in English: Cordova) is a city in Andalucía, southern Spain, and the capital of the province of Córdoba. Located at 37.88° North, 4.77° West, on the Guadalquivir river, it was founded in ancient Roman times as Corduba by Claudius Marcellus. Its population is 321,164 as of 2005. Today a moderately-sized modern city, the old town contains many impressive architectural reminders of when Córdoba was the thriving capital of the Caliphate of Córdoba that governed almost all of the Iberian peninsula. It has been estimated that Córdoba, with up to 500,000 inhabitants in the tenth century, was the largest city in Western Europe and, perhaps, in the world