The mainstream explanation for the name is that it is an ethnonym derived from the Castro people, also known as the Callaeci, Gallaeci or Gallaecia, a people who occupied the north-west of the Iberian Peninsula. The names Callaici and Cale are the origin of today's Gaia, Galicia, and the -gal in Portugal. The meaning of Cale or Calle is, however, not fully understood.
The medieval Scottish historian Hector Boece thought the name Portugal was derived from Porto Gatelli, the name Gatelo gave to Braga when he settled there, while others say he gave it to Porto.
Other historians have argued that Greeks were the first to settle Cale and that the name derives from the Greek word Καλλις kallis, 'beautiful', referring to the beauty of the Douro valley. Others have hypothesized that the word Cale came from the Latin word for 'warm' (Portus Cale thus meaning 'warm port').
The Roman general Decimus Junius Brutus Callaicus conquered the region and founded the Roman city Portus Cale in around 136 BC.
At the end of Brutus' campaigns, Rome controlled the territory between the Douro and Minho rivers plus probable extensions along the coast and in the interior. It was only under Augustus, however, at the end of the 1st century BC, that present north Portugal and Galicia were fully pacified and under Roman control. During the Roman occupation, the city developed as an important commercial port, primarily in the trade between Olisipo (the modern Lisbon) and Bracara Augusta (the modern Braga).
As the Roman Empire declined, these regions fell under Suebi dominion, between 410 and 584. These Germanic invaders settled mainly in the areas of Braga (Bracara Augusta), Porto (Portus Cale), Lugo (Lucus Augusti) and Astorga (Asturica Augusta). Bracara Augusta, capital of Roman Gallaecia, became the capital of the Suebi. As trade collapsed, Portus Cale went into decline.
Another Germanic people, the Visigoths, also invaded the Iberian Peninsula and would eventually conquer the Suebi kingdom in 584. The region around Cale became known by the Visigoths as Portucale. Portus Cale would fall under the Moorish invasion of the Iberian Peninsula in 711.
In 868, Vímara Peres, a Christian warlord from Gallaecia and a vassal of the King of Asturias, Léon and Galicia, Alfonso III, was sent to reconquer and secure from the Moors the area from the Minho River to the Douro River, including the city of Portus Cale, and founded the First County of Portugal or Condado de Portucale. Portus Cale is thus the former name of current-day Porto and Vila Nova de Gaia's riverside area, that would be used to name the whole region and, later, the country.
Origin of Portugal's name
Portugal's name derives from the Roman name Portus Cale. Portucale evolved into Portugale during the 7th and 8th centuries, and by the 9th century, Portugale was used extensively to refer to the region between the rivers Douro and Minho, the Minho flowing along what would become the northern border between Portugal and Galicia.
Cale and the origin of the name of Galicia
The origin of the name Galiza (Calecia, Gallaecia) may be found in the root cale, which also appears in words like kallaikoí or galaicos. Many scholars believe that the origins of the name Galaicos was in the area around the mouth of the Douro river and the Romans then used this name to refer to all the Celtic-speaking Castro people of the Iberian Peninsula's north-west, an area they named Gallaecia.
Some southeastern Indo-European tongues name the orange after Portugal, which was formerly the main source of import of sweet oranges. Examples are Bulgarian and Macedonian portokal [портокал], Greek portokali [πορτοκάλι], Romanian portocală, and Persian porteghal [پرتقال].
Also, in southern Italian dialects (eg Neapolitan), an orange is portogallo or purtuallo, literally "(the) Portuguese (one)". Some non-European languages also refer to the fruit and/or tree similarly: Turkish portakal, Arabic al-burtuqal [البرتقال], Georgian phortokhali [ფორთოხალი], and Amharic birtukan.
- Proceedings of the Royal Irish Academy. Royal Irish Academy. 1864. p. 382.
- Michaud, Joseph Fr.; Michaud, Louis Gabriel (1832). Biographie universelle, ancienne et moderne. Michaud. p. 312.
- Fuentes, Alvaro Galmés de (2000). Los topónimos: sus blasones y trofeos (la toponimia mítica). Real Academia de la Historia. p. 111. ISBN 978-84-89512-79-5.
- Various (2011). "history of Porto - Google Search". google.co.uk. Retrieved 5 July 2011.