Amadeus VIII of Savoy was a notable figure in the 15th century, serving as the Duke of Savoy from 1434 until his abdication in 1440. He was born in 1383 and became known for his efforts to strengthen the power and influence of the House of Savoy in the region. His reign was marked by political maneuvering and alliances that helped to expand the territory of Savoy. In 1439, Amadeus VIII was elected as the Antipope Felix V during a period of schism in the Catholic Church. His election was controversial, as it challenged the authority of the legitimate pope. After his abdication in 1440, he retired to a monastic life, leaving a legacy of both political and religious significance.