Decimus Junius Brutus Callaicus was appointed consul in 138 BC (jointly with Publius Cornelius Scipio Nasica Serapio).

Brutus led the Roman legions in the conquest of western Iberia after the death of Viriathus, chieftain of the Lusitanians and the defeat of his successor, Tantalus by Q. Servilius Caepio.

In his conquest, he scored major victories in the south of modern Portugal, before going on to the north. He had the city of Olissipo (modern Lisbon) fortified and advanced to the north, destroying settlements as he went. Cividade de Terroso, in the outskirts of modern Póvoa de Varzim, was one of the major native cities in the hearthland of Castro Culture (Coastal Northern Portugal), with notable Carthaginian influence in trade and culture, shows clear archeological signs of complete destruction and burning dating to the time of Decimus Junius Brutus. After the conquest, the city was rebuilt using some Roman principles.

The city of Talabriga (current day Marnel, near Águeda) was taken, a fortified position was established at Vissaium (Viseu), the Douro river was crossed and the Lima river was reached by 137 BC. Ultimately, according to Strabo, Brutus reached the Minho River.

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.

Married to Claudia Pulchra av CLAUDII -168--110 with
M Decimus Brutus av JUNII -130--63
F Junia Bruta av JUNII -120--55

Gift med
Claudia Pulchra av Claudii, född -168 i Roma, Lazio, Italien, död -110 i Roma, Lazio, Italien.

Barn:
Junia Bruta av Junii, född -120, död -55