Rama V, also known as King Chulalongkorn, was the fifth monarch of the Chakri Dynasty in Thailand. He reigned from 1868 to 1910 and is celebrated for modernizing the country. His efforts included reforms in education, healthcare, and infrastructure, which helped transform Thailand into a more progressive nation. During his reign, Rama V abolished slavery and promoted the rights of the common people. He also established diplomatic relations with Western countries, ensuring Thailand's sovereignty during a time of colonial expansion in Southeast Asia. His legacy is remembered for fostering national unity and modernization.