This number does not include the Lusophone diaspora, estimated at approximately 10 million people (including 4.5 million Portuguese, 3 million Brazilians, and half a million Cape Verdeans, among others), although it is hard to obtain official accurate numbers of diasporic Portuguese speakers because a significant portion of these citizens are naturalized citizens born outside of Lusophone territory or are children of immigrants, and may have only a basic command of the language.
Additionally, a large part of the diaspora is a part of the already-counted population of the Portuguese-speaking countries and territories, such as the high number of Brazilian and PALOP emigrant citizens in Portugal or the high number of Portuguese emigrant citizens in the PALOP and Brazil.
Portuguese is part of the Ibero-Romance group that evolved from several dialects of Vulgar Latin in the medieval Kingdom of Galicia, and has kept some Celtic phonology and lexicon.
When the Romans arrived at the Iberian Peninsula in 216 B. D., as the Roman Empire collapsed in Western Europe, the Iberian Peninsula was conquered by Germanic peoples of the Migration Period.
C., they brought the Latin language with them, from which all Romance languages descend. The occupiers, mainly Suebi and Visigoths who originally spoke Germanic languages, quickly adopted late Roman culture and the Vulgar Latin dialects of the peninsula and over the next 300 years totally integrated into the local populations.
Its spread was helped by mixed marriages between Portuguese and local people and by its association with Roman Catholic missionary efforts, which led to the formation of creole languages such as that called Kristang in many parts of Asia (from the word cristão, "Christian").
The language continued to be popular in parts of Asia until the 19th century.
In the second period of Old Portuguese, in the 15th and 16th centuries, with the Portuguese discoveries, the language was taken to many regions of Africa, Asia, and the Americas.