Carlos I, also known as Charles V, was a significant ruler in European history during the 16th century. He was born in 1500 and became the Holy Roman Emperor in 1519. His reign included vast territories across Europe, including Spain, the Netherlands, and parts of Italy. Carlos I was known for his efforts to maintain Catholicism and combat the Protestant Reformation. Throughout his rule, Carlos I faced numerous challenges, including wars with France and conflicts with the Ottoman Empire. In 1556, he abdicated the throne, dividing his empire between his son, Philip II of Spain, and his brother, Ferdinand I. Carlos I spent his later years in a monastery in Yuste, Spain, where he died in 1558.