The National Monument was established to commemorate the 200th anniversary of the Rattanakosin Kingdom, serving as a tribute to the great kings and heroic individuals of Thailand who sacrificed their lives for the nation. The idea for the National Monument arose from the vision of General Saiyud Kerdphol, a former Commander-in-Chief of the Armed Forces. He noted that the government had previously constructed monuments to honor those who lost their lives in various wars, such as the Volunteer Soldier Monument for those who perished in World War I, the Constitution Defense Monument for the suppression of the Boworn Decha rebellion, and the Victory Monument dedicated to the Thai-French conflict and World War II. However, conflicts continued to arise in subsequent years, including the Korean War, the Vietnam War, and efforts to combat terrorism, resulting in the deaths of military personnel, police officers, and civilians alike. Every year, His Majesty King Bhumibol Adulyadej graciously presided over the cremation ceremonies for these fallen heroes. Yet, the remains of these individuals who gave their lives for the nation have been collected without the honor of a permanent structure to commemorate their ultimate sacrifice.