Infante Don Carlos was a Spanish royal born on January 5, 1545, as the son of King Philip II of Spain and Maria Manuela of Portugal. He was a prominent figure in the Spanish court and is known for his claim to the Spanish throne, which led to political tensions during his lifetime. His life was marked by struggles for power and influence within the royal family. Don Carlos became infamous for his erratic behavior and conflicts with his father, which ultimately resulted in his imprisonment. He died under mysterious circumstances on July 24, 1568, at the age of 23, leaving behind a legacy of intrigue and controversy in Spanish history.