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In page Burgos:

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There are several possible origins for the toponymy. When the city was founded, the inhabitants of the surrounding country moved into the fortified village, whose Visigothic name of Burgos signified consolidated walled villages[citation needed] (Gothic baurgs).[1] The cities Burgas in Bulgaria and numerous cities containing the Germanic burg "city" such as Hamburg have a similar literal composition. The city began to be called Caput Castellae ("Cabeza de Castilla" or "Head of Castile").[2]