Initially a client tribe of the Autrigones, the Turmodigi threw off their yoke with the help of the Vaccei around the early 3rd Century BC, seizing most of the former’s lands corresponding today to the central and western Burgos province and the eastern Palencia province. Like their Autrigones’ and Vaccei neighbours, the Turmodigi retained a separated identity until the later 1st Century BC, when they were first conquered and included in Hispania Citerior by Pompey and Quintus Caecilius Metellus Pius in 73 BC. However, the Turmodigi were not subdued until 56 BC, after a joint uprising with the Vaccei and other peoples was defeated by the "Praetor" Quintus Caecilius Metellus Nepos. Subjected to Cantabri and Astures' raids, they allied themselves with Rome during the Astur-Cantabrian wars in the late 1st century BC, even allowing Emperor Augustus’ to establish its own headquarters at their capital Segisama and turned Turmodigia into a rear base for the conquest of both Asturias and Cantabria.