The Rattanakosin Kingdom is a historical period in Thailand that began in 1782 when King Rama I established the capital in Bangkok. This era marked the beginning of the Chakri Dynasty, which continues to this day. The kingdom is known for its significant cultural and architectural developments, including the construction of the Grand Palace and Wat Phra Kaew. During the Rattanakosin period, Thailand underwent modernization and reforms, especially in the 19th century under King Rama V. The kingdom played a crucial role in maintaining Thailand's independence during colonial pressures in Southeast Asia. Today, the legacy of the Rattanakosin Kingdom is evident in Thailand's rich traditions and historical sites.