Amadeus VIII was born on 4 September 1383 in Chambéry, then the capital of the County of Savoy. His father was Amadeus VII, Count of Savoy, known to history as the Red Count, and his mother was Bonne of Berry, a niece of King Charles VI of France. From childhood, Amadeus suffered from strabismus, a misalignment of the eyes, which one of his father's physicians, Jean de Grandville, claimed he could correct. Whether the treatment was ever attempted or succeeded is unrecorded. What is certain is that the boy would grow up to be one of the most capable and far-sighted rulers the House of Savoy ever produced.
His path to power was abrupt and complicated. In November 1391, Amadeus VII died under circumstances that remained suspicious. The death was attributed to either poisoning or gross medical negligence. Amadeus VIII, barely eight years old, inherited the county. What followed was an immediate struggle over the regency. In his testament, the Red Count had named his own mother, Bonne of Bourbon, as regent rather than his widow, Bonne of Berry. The two women, grandmother and mother of the young count, competed for control of the court, drawing in powerful French princes including the dukes of Berry and Bourbon and King Charles VI himself. Bonne of Bourbon prevailed and served as regent until 1397, when Amadeus came of age and assumed direct control of the county.
The early years of his personal rule were marked by a systematic effort to consolidate and centralize the Savoyard state. Amadeus strengthened institutions, imposed administrative order, and pursued a steady policy of territorial expansion. His patient diplomacy and reputation for reasonableness earned him the nickname the Peaceful, a striking honorific in an era when rulers were more often celebrated for military aggression. His territorial ambitions were nonetheless real. From 1401 to 1422 he conducted prolonged campaigns to secure the area around Geneva and Annecy, extending Savoyard influence into strategically important Alpine territories.
His greatest political recognition came in 1416, when Sigismund, King of the Romans, elevated Savoy from a county to a duchy and granted Amadeus the ducal title. It was an acknowledgment of the power and prestige he had built over a quarter century of careful rule. Two years later, in 1418, his distant cousin Louis of Piedmont died without male heirs, making Amadeus the heir-general of both lines of the House of Savoy. The unification of the male lines under a single ruler was a dynastic consolidation of the first order, giving the duchy a cohesion it had long lacked. Amadeus also participated in international diplomacy at the highest level, encouraging multiple attempts to negotiate an end to the devastating Hundred Years' War between France and England.
Personal grief reshaped the later portion of his life as ruler. After the death of his wife in 1428, Amadeus underwent a spiritual transformation. In 1434, together with six other knights, he founded the Order of Saint Maurice. The small company then withdrew to the castle of Ripaille, located near Geneva on the shores of Lake Geneva, where they lived in a quasi-monastic state according to a rule that Amadeus himself had written. He took the title Decanus Militum solitudinis Ripalliae, the Dean of the Knights of the Solitude of Ripaille. Before his retreat, he appointed his son Louis as regent of the duchy, ensuring orderly governance in his absence.
What followed from Ripaille was one of the strangest episodes in the history of the medieval papacy. Amadeus was deeply sympathetic to the conciliarist movement, which held that the authority of general Church councils was superior to that of the pope. The Council of Basel, which had been meeting since 1431, became the focal point of this movement. Even after most of its members departed for the Council of Florence convened by Pope Eugene IV in 1438, a rump group at Basel continued to press the conciliarist cause. On 24 January 1438, at its thirty-first session, the Council suspended Pope Eugene IV. On 25 June 1439, it formally deposed him as a heretic. The Council's president, Cardinal Louis Aleman, the Archbishop of Arles, reminded the remaining members that they needed to elect a pope who was wealthy and powerful enough to defend the council against its enemies.
The conclave convened at Basel on 31 October 1439. Thirty-three electors, drawn from five national groupings within the council, cast their ballots. In the first scrutiny, Amadeus received sixteen votes. In the second, nineteen. In the third, twenty-one. On 5 November 1439, he received twenty-six votes, which was enough for election. The council issued a formal decree on 17 November confirming his election as pope. A delegation that included the humanist and future pope Aeneas Silvius Piccolomini traveled to Ripaille to deliver the news. Amadeus accepted, taking the name Felix V.
He became the last antipope in Catholic history to be recognized by a significant portion of the Church's clergy. His tenure lasted a decade, from 1439 to 1449, during which he remained in opposition to first Eugene IV and then Nicholas V. His position was always stronger in parts of central Europe than in Italy or the broader Catholic world, and his court at Basel and later at other venues never achieved the institutional weight of Rome. Ultimately, the conciliarist movement was unable to prevail against the restored papacy, and Felix V abdicated in April 1449 in exchange for various honors and the position of papal legate, making a graceful but definitive end to the last great schism of the Western Church.
After his abdication, Amadeus retired and died on 7 January 1451, bringing to a close an extraordinary life that had encompassed the roles of warrior, administrator, monk, and antipope. His primary legacy is as Duke of Savoy, the man who transformed a modest Alpine county into a recognized duchy and laid the administrative and territorial foundations for what would eventually become the House of Savoy's long-lasting prominence in European affairs. The episode of his antipapacy, however, remains the most singular chapter of his story, a moment when a retired prince in a lakeside castle was drawn back into the center of European Christendom's most contentious theological argument.
