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.
Thomas III of Piedmont
Count Thomas III( c. 1246 – 16 May 1282), 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.
Upon the death of his father, Thomas became Count in his paternal estates in 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.
Thomas III married in 1274 to Guia of Burgundy, the stepdaughter of his uncle Philip I of Savoy and they had five children: 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.
Thomas III was fatally wounded in a border dispute with Humbert I of Viennois in 1282.
Prince Umberto, Count of Salemi
Prince Umberto of Savoy (22 June 1889 – 19 October 1918) was a member of the Aosta branch of the House of Savoy and was styled the Count of Salemi.
Yolande Louise of Savoy
Yolande Louise of Savoy( 1487–1499), was a Duchess Consort of Savoy; married to Philibert II, Duke of Savoy.
Adelaide of Susa
Adelaide of Turin (also "AdelheidAdelais", or "Adeline"; – 19 December 1091) was the Countess of part of the March of Ivrea and the Marchioness of Turin in Northwestern Italy from 1034 to her death.
She was the last of the Arduinici and is often incorrectly associated with Susa.
She is sometimes compared to her second cousin, and close contemporary, Matilda of Tuscany.
Bertha of Aragon
Bertha of Aragon( c. 1075 – bef. 1111) was a Queen consort of Aragon and Navarre.
Nothing is known about her childhood or the names of her parents, it is believed that she is Italian since her name was" Berta", which is Italian.
She was married to Peter I of Aragon in 1097, shortly after the death of Peter's first wife, Agnes of Aquitaine, with whom he had two children: Peter and Isabella.
Bertha and Peter had no children.
Peter and Isabella were both dead by 1104 and King Peter needed an heir.
They had no children and Peter died the following year.
The crown of Aragon and Navarre passed to Alfonso who was the half brother of Peter.
Bertha got a dower but Alfonso got all of Peter's lands.
It is unknown when Bertha died or where she died.
Genealogist Szabolcs de Vajay has speculated that Bertha may have been a daughter of Peter I, Count of Savoy, and another Agnes of Aquitaine, perhaps the Agnes who was the final wife of Peter's father Ramiro I of Aragon and first- cousin of Peter's own first wife.
René of Savoy
René of Savoy( 1473 – 31 March 1525) was a French nobleman and soldier.
He was count of Villars( 1497) and of Tende( 1501).
Known as" the Great Bastard of Savoy", he was the illegitimate son of Philip II, Duke of Savoy and Libera Portoneri- this made him the originator of the Savoie- Villars( or Savoie- Tende) branch of the House of Savoy.
Peter I, Count of Savoy
Peter I (c. 1048 – 9 August 1078) was count of Savoy and margrave of Turin jointly with his brother Amadeus II of Savoy from c. 1060 to 1078.
He ruled only nominally, as true power was in the hands of his mother, Adelaide of Susa.
Peter presided over court hearings alongside Adelaide and also issued several donation charters with her and his brothers
Amadeus II of Savoy and Otto.
Shortly before his death, Peter united with Bishop Cunibert of Turin in an attempt to drive Abbot Benedict II from his abbey of San Michele della Chiusa.
Peter married Agnes of Aquitaine, c.1065.
They had two daughters:
Beatrice of Viennois
Beatrice of Vienne( 1160 –1230) was a Countess of Savoy by marriage to Humbert III, Count of Savoy.
Amadeus III, Count of Savoy
Amadeus III of Savoy (1095 – April 1148) was Count of Savoy and Maurienne from 1103 until his death.
He was also known as a crusader.

Question: When did Peter I, Count Of Savoy's mother die?
Answer: 19 December 1091