Louis I was the Baron of Vaud. At the time of his birth he was a younger son of the House of Savoy, but through a series of deaths and his own effective military service, he succeeded in creating a semi-independent principality in the pays de Vaud by 1286. He travelled widely in the highest circles of European nobility, obtained the right to mint coins from the Holy Roman Emperor, and convoked the first public assembly in the Piedmont to include members of the non-noble classes. When he died, his barony was inherited by his son.

The Barony of Vaud was an appanage of the County of Savoy, corresponding roughly to the modern Canton of Vaud in Switzerland. It was created by a process of acquisition on the part of a younger brother of the reigning count beginning in 1234 and culminated in the formalisation of its relationship to the county in 1286. It was semi-independent state, capable of entering into relations with its sovereign, the Holy Roman Emperor, and of fighting alongside the French in the Hundred Years' War. It ceased to exist when it was bought by the count in 1359. It was then integrated into the Savoyard state, where the title Baron of Vaud remained a subsidiary title of the heads of the family at least as late as the reign of Charles Albert of Sardinia, although the territory of the barony was annexed by the Canton of Bern during the Protestant Reformation (1536).