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Carlos was mentally unstable and was imprisoned by his father in early , dying after half a year of solitary confinement. His paternal grandfather, Emperor Charles V , was the reigning king of Spain. Carlos's mother Maria died four days after the birth of her son from a haemorrhage she had suffered following the birth.
The young Infante Carlos was delicate and deformed. He grew up proud and willful and, as a young adult, began to show signs of mental instability. Many of his physical and psychological afflictions may have stemmed from the inbreeding common to his family, the House of Habsburg , and the royal houses of Portugal House of Aviz and Spain. He had only six great-great-grandparents, instead of the maximum 16;  his maternal grandmother and his paternal grandfather were siblings, his maternal grandfather and his paternal grandmother were also siblings, and his two great-grandmothers were sisters.
Carlos lost his mother four days after his birth. He was raised by his aunts and, after their marriages, with other family members. According to the courtesan Gramiz, Carlos was spoiled, emotionally unstable, and not very bright.
The descriptions of his behaviour suggest that he suffered from some serious mental problems. Rumour in the Spanish court had it that he enjoyed roasting animals alive and in one occasion blinded all the horses in the royal stables. At age eleven he ordered the whipping of a serving girl for no known reason. The Venetian ambassador, Hieronymo Soranzo, thought that Carlos was "ugly and repulsive" and claimed that Carlos liked to roast animals alive and once tried to force a shoemaker to eat shoes Carlos had found unsatisfactory.
Another Venetian, Paolo Tiepolo, wrote: "He [Prince Carlos] wished neither to study nor to take physical exercise, but only to harm others. From , Honorary Juan was in charge of both his education and his library. Said library was based on books on Spanish history, Aragonese history, Portuguese history, Mathematics, Astronomy and Cartography. He had no books in Latin, which was strange given his age and rank, but he had various books in Portuguese and started learning German in It is suggested that the accident of didn't damage his intellectual ability, even though this is unclear.