The origins of Sardinian have been investigated by Eduardo Blasco Ferrer and others. The language derives from Latin and a pre-Latin, Paleo-Sardinian (Nuragic) substratum, but has been influenced by Catalan and Spanish due to the dominion of the Crown of Aragon and later the Spanish Empire over the island. Logudorese is the northern macro-dialect of the Sardinian language, the southern macro-dialect being Campidanese, spoken in the southern half of the island. The two dialects share a clear common origin and history, but have experienced somewhat different developments.