Louis II (1283×94 – 1348×49), of the House of Savoy, was the Baron of Vaud from 1302 until his death. A military man, he fought widely in Italy and, during the first phase of the Hundred Years' War, in France. As a diplomat he visited England and the papal court in Rome and Avignon, and he served as regent of the County of Savoy between 1343 and his death, during which period he was the leader of the House of Savoy.
Louis married Isabelle, daughter of John I, lord of Arlay, of the House of Chalon. With her he had at least one son and one daughter:
In 1308 Louis was one of those representing the Savoyards at the coronation of Edward II of England in Westminster Abbey. In 1310 he joined the expedition of Henry VII into Italy to be crowned Emperor, and was himself made a Senator of Rome. He continued to serve Henry's cause in Italy until 1313. His grandiloquent title at this time was "Louis of Savoy, a magnificent man, by the grace of God a most illustrious senator of the city of Rome".
Between 1314 and 1322, Louis led several campaigns against the Dauphiné, a traditional rival of Savoy. In 1322 his uncle and suzerain, Amadeus V, Count of Savoy, appointed him lieutenant-general of the Canavese, south of the Alps, and in 1330 he made him a member of the Council of Savoy, the highest organ of state in Savoy. In 1331 Louis was campaigning in Lombardy in an effort to carve out a new kingdom for John the Blind, King of Bohemia. The king installed his son, the future Emperor Charles IV, as his vicar in Lombardy, and appointed Louis to be Charles's chief counsellor. The baron of Vaud had to decline the office on account of a conflict of interests, since his eldest daughter Catherine had just married Azzone Visconti, lord of Milan.