Louis of Piedmont
Louis( 1364 – 11 December 1418) was the Lord of Piedmont and titular Prince of Achaea from 1402.
He was a son of James of Piedmont and Marguerite de Beaujeu( 1346 – 1402).
In 1405, he founded the University of Turin.
On 24 January 1403, he married Bona( 1388 – 1432), daughter of Amadeus VII, Count of Savoy, but they never had any children.
When he died in 1418, the Piedmont- Achaea cadet branch of the House of Savoy died with him.
His titles and estates were inherited by the senior line of the House of Savoy.
Amadeus VII, Count of Savoy
Amadeus VII (March 1360, Chambéry – 1 November 1391), known as the Red Count, was Count of Savoy from 1383 to 1391.
Amadeus was the son of Amadeus VI, Count of Savoy and Bonne of Bourbon.
Amadeus VII was known for his hospitality, for he would entertain people of all stations and never turned a person from his table without a meal.
He married Bonne of Berry, daughter of John, Duke of Berry, who was the younger brother of Charles V of France.
They had three children:
Upon his death at age 29 from tetanus, controversy arose because of his will.
Amadeus VII left the important role of guardian of his son and heir, Amadeus VIII, to his own mother, a sister of the powerful Duke de Bourbon, instead of following the tradition of appointing the child's mother, who was a daughter of the equally powerful Duke de Berry.
It took three months of negotiations to restore peace in the family.
Amadeus IV of Geneva
Amadeus IV( died 1369) was the Count of Geneva from 1367 until his death.
He was the second son of Amadeus III and Mahaut d'Auvergne.
He succeeded his childless brother Aymon III in August 1367.
He reversed the policy of his father and brother respecting the House of Savoy, and supported the bishops of Lausanne and Geneva against his cousin Amadeus VI of Savoy.
Amadeus seems to have come to terms with his Savoyard cousin by 13 May 1368, the date on which he performed the act of homage to him for the county of Geneva.
He then travelled with the count of Savoy into Italy for the campaign to bring Philip II of Piedmont to submission, and was present at Philip's trial by a stacked Savoyard court at Rivoli in September – October 1368.
It is possible that the real reason for his accompanying Amadeus into Italy was to have an opportunity to speak with the Emperor, who was also in the region at that time.
In February 1369 the Emperor repeated his revocation of Amadeus VI's vicariate.
Amadeus IV died later that year.
Joan of Geneva
Joan of Geneva( born c. 1040, died 1095) was a Countess Consort of Savoy; married to Amadeus II, Count of Savoy.
According to the much later" Chronicles of Savoy", Amadeus married Joan, daughter of" Girard, Count of Burgundy", which scholars have surmised to have been Count Gerold of Geneva.
The" Chronicon Altacumbae" says only that" the wife of Amadeus[ was] from Burgundy", which might refer to Amadeus I.
If his wife were Genevan, it would explain how the house of Savoy came so early to possess a large portion of the Genevois.
His wife, whatever her name and origins, bore Amadeus II several children, although there is some uncertainty about how many:
Amadeus VI, Count of Savoy
Amadeus VI (4 January 1334, Chambéry – 1 March 1383, Campobasso), nicknamed the Green Count  was Count of Savoy from 1343 to 1383.
He was the eldest son of Aymon, Count of Savoy and Yolande Palaeologo of Montferrat.
Though he started under a regency, he showed himself to be a forceful leader, continuing Savoy's emergence as a power in Europe politically and militarily.
He participated in a crusade against the Turks who were moving into Europe.
Amadeus VIII, Duke of Savoy
Amadeus VIII( 4 September 1383 – 7 January 1451) was a Savoyard nobleman, the son of Amadeus VII, Count of Savoy and Bonne of Berry.
He was surnamed the Peaceful.
After the death of his father in 1391, his mother acted as a regent, because of his youth.
He was an antipope of the Catholic Church from 1439 to 1449 as Felix V, in opposition to Popes Eugene IV and Nicholas V.
Cecile of Baux
Cecile of Baux( 1230 – 1275), was a Countess Consort of Savoy; married in 1244 to Amadeus IV, Count of Savoy.
She was the daughter of Barral of Baux and his wife, Sibylle d'Anduze.
She was the Regent of Savoy during the minority of her son, Boniface, Count of Savoy, from 1253 until 1259.
Yolande Louise of Savoy
Yolande Louise of Savoy( 1487–1499), was a Duchess Consort of Savoy; married to Philibert II, Duke of Savoy.
Humbert II, Count of Savoy
Umberto II, nicknamed the Fat( 1065, Carignano, Piedmont – 19 October 1103), was Count of Savoy from 1080 until his death in 1103.
He was the son of Amadeus II of Savoy.
He was married to Gisela of Burgundy, daughter of William I, Count of Burgundy, and had 7 children:
Frederick VII, Count of Zollern
Friedrich VII, Count of Zollern( d. after 6 October 1309) was a German nobleman.
He was the ruling Count of Zollern from 1298 until his death.

Question: Who is the paternal grandfather of Amadeus Vii, Count Of Savoy?
Answer: Aymon, Count of Savoy