Holy Roman Emperor Leopold I ruled from 1658 until his death in 1705. He was a member of the Habsburg dynasty and played a significant role in European politics during his reign. Leopold I is known for his efforts to strengthen the empire and defend it against external threats, particularly from the Ottoman Empire. Leopold I's reign was marked by military conflicts, including the Great Turkish War, which ultimately led to the Habsburgs gaining territory in Hungary. He also supported the arts and culture, fostering a vibrant court life in Vienna. His legacy includes the promotion of Baroque architecture and the establishment of a more centralized imperial authority.