Spaniards ( ) are a nation and ethnic group native to Spain that share a common Spanish culture and speak the Spanish language as a mother tongue. Within Spain there are a number of nationalisms and regionalisms, reflecting the country's complex history and diverse culture. The official language of Spain is Spanish (also known as Castilian), a standard language based on the mediaeval dialect of the Castilians of north-central Spain. There are several commonly spoken regional languages (mainly Basque, Catalan and Galician). There are substantial populations outside Spain with ancestors who emigrated from Spain; most notably in Hispanic America.