Thomas III of Piedmont
When his first cousin Boniface, Count of Savoy died in 1263, the 15-year-old Thomas regarded himself as the successor of the deceased, and claimed the county and the headship of the house. However, his late father's younger brother Peter II, Count of Savoy, a sonless nobleman who had resided in England for much of his life, was recognized as count. After Peter's death in 1268, Thomas continued his claim although Philip of Savoy, archbishop of Lyon, the youngest surviving brother of his father and also sonless, succeeded in the county and was recognized.
Thomas III, as he was the eldest son and heir of Thomas II, felt an injustice in being surpassed by younger brothers of his father, and claimed unsuccessfully Savoy from his uncles.
- Philip, first of the line of Savoy-Achaea, lasting from 1285 to 1418
Philip and Thomas were in dispute much of their reigns 1268–82. Thomas' marriage was a rather unsuccessful attempt to patch up things and get Philip to recognize hims as the successor in Savoy, which would have belonged to Thomas, him being the eldest son of Thomas II and thus the founder of the genealogically senior line of the House of Savoy. Philip’s will charged his niece Eleanor of Provence and her son King Edward I of England with the inheritance of Savoy.
- Eugene L. Cox, The Eagles of Savoy, 462.
- Eugene L. Cox, The Eagles of Savoy, (Princeton University Press, 1974), 463.
- A Letter from Lewis of Savoy to Edward I, A. J. Taylor and Lewis of Savoy, The English Historical Review, Vol. 68, No. 266 (Jan., 1953), 58-59.
|16. Amadeus III of Savoy|
|8. Humbert III of Savoy|
|17. Matilda of Albon|
|4. Thomas I of Savoy|
|18. Gerad I of Mâcon and Vienne|
|9. Beatrice of Viennois|
|19. Maurette of Salins|
|2. Thomas II of Piedmont|
|20. Amadeus I of Geneva|
|10. William I of Geneva|
|21. Matilda of Cuiseaux|
|5. Margaret of Geneva|
|22. Aimon of Faucigny|
|11. Beatrice of Faucigny|
|1. Thomas III of Piedmont|
|24. Teodoro II Fieschi of Lavagna|
|12. Ugo Fieschi of Lavagna|
|6. Teodoro III Fieschi of Lavagna|
|26. Amico di Grillo|
|13. Brumisan di Grillo|
|3. Beatrice Fieschi|
|14. Raymond della Volta de Capo-Corso|
|7. Simone della Volta|