Background of the Fort
After King Rama V (King Chulalongkorn, 1868-1910) ascended the throne, he realized that Thailand was at risk from falling prey to European nations hunting for colonies at that time because neighbouring countries like Vietnam and Cambodia were all colonized. He, then commanded to restore existing forts and to build a brand new one at the estuary of the Chao Phraya River.
The new fort construction began in 1884 and was completed in 1893. King Rama V bestowed his name to the fort as "Phra Chulachomklao Fort". Chulachomklao is the official title that the Thais call King Rama V.