Philip I, known as Philip of Savoy (1278 – September 25, 1334) was the lord of Piedmont

Lord of Piedmont

The lordship, later principality of Piedmont was originally an appanage of the Savoyard county and as such its lords were members of the Savoy-Achaea branch of that illustrious house. The title was inherited by the elder branch of the dynasty in 1418, at about which time Savoy was elevated to...

 from 1282 until his death and prince of Achaea between 1301 and 1307. He was the son of Thomas III of Piedmont

Thomas III of Piedmont

Count Thomas III , called Thomas of Savoy or de Savoie, was the lord of Piedmont and a claimant to the county of Savoy from 1268.He was the eldest son of Thomas II of Savoy and Beatrice di Fieschi, niece of Pope Innocent IV....

 and Guyonne de Châlon.

Philip's first marriage was celebrated in Rome

Rome

Rome is the capital of Italy and the country's largest and most populated city and comune, with over 2.7 million residents in . The city is located in the central-western portion of the Italian Peninsula, on the Tiber River within the Lazio region of Italy.Rome's history spans two and a half...

 on February 12, 1301 to Isabella of Villehardouin

Isabella of Villehardouin

Isabella of Villehardouin was the elder daughter of William II of Villehardouin, Prince of Achaea, and of his second wife Anna, the third daughter of Michael II Komnenos Doukas, the despot of Epiros....

, Princess of Achaea. By that marriage, he became Prince of Achaea, though he had already been lord of Piedmont by inheritance from his father in 1282. As prince, Philip ventured to reconquer all of Lacedaemonia

Lacedaemonia

Lacedaemonia may mean:*Laconia, a modern prefecture of Greece*The ancient region of Greece of the same name; see Laconia *Lacedaemonia, the name borne by the city of Sparta from Late Antiquity to the 19th century....

 from the Greeks

Byzantine Empire

The Byzantine Empire was the Eastern Roman Empire during the periods of Late Antiquity and the Middle Ages, centred on the capital of Constantinople. Known simply as the Roman Empire or Romania to its inhabitants and neighbours, the Empire was the direct continuation of the Ancient Roman State...

. He was, however, an authoritative prince and this put him at odds with the baronage of his realm. He tried to placate the barons of Morea

Morea

The Morea was the name of the Peloponnese peninsula in southern Greece during the Middle Ages and the early modern period. It also referred to a Byzantine province in the region, known as the Despotate of Morea.-Origins of the name:...

, but was forced to accept a parliament

Parliament

A parliament is a legislature, especially in those countries whose system of government is based on the Westminster system modeled after that of the United Kingdom. The name is derived from the French , the action of parler : a parlement is a discussion. The term came to mean a meeting at which...

 in 1304. The Greek peasantry, crushed by taxes, then revolted in turn. In 1307, King Charles II of Naples

Charles II of Naples

Charles II, known as "the Lame" was King of Naples, King of Albania, Prince of Salerno, Prince of Achaea and Count of Anjou.-Biography:...

, the suzerain of Achaea, confiscated the principality and gave it to his son, Prince Philip I of Taranto

Philip I of Taranto

Philip I of Taranto : of the Angevin house, was titular Emperor of Constantinople , despot of Epirus, King of Albania, Prince of Achaea and Taranto, and Lord of Durazzo....

.

In 1312, Philip married Catherine de la Tour du Pin (died 1337) and had issue:

• James of Piedmont
  James of Piedmont
  James was the Lord of Piedmont from 1334 to his death. He was the eldest son of Philip I and Catherine de la Tour du Pin. While his father had abandoned his claim to the Principality of Achaea in 1307, James continued to use the princely title and even passed it on to his successors.James opposed...
  
  
• Eleanor married Manfred V of Saluzzo
  Manfred V of Saluzzo
  Manfred V was marquess of Saluzzo from 1330 and 1332, and later usurper from 1341-1342.He was the second son of Manfred IV of Saluzzo and first by his second wife, Isabella Doria. The influence of his mother at court caused his father to appoint him to succeed him as sixth marquess of Saluzzo...
  
   and had issue.
• Beatrice married Humbert de Thoire and had issue.
• Agnes married John de la Chambre and had issue.
• Joan married Aymer of Valentinois and had issue.