The precise origin of the Phi Ta khon is unclear. However, it can be traced back to a traditional Buddhist folklore. In the Buddha’s next to last life, he was the beloved Prince Vessandorn. The prince was said to go on a long trip for such a long time that his subjects forgot him and even thought that he was already dead. When he suddenly returned, his people were over-joyed. They welcomed him back with a celebration so loud that it even awoke the dead who then joined in all the fun.
From that time onward the faithful came to commemorate the event with ceremonies, celebrations and the donning of ghostly spirit masks. The reasons behind all the events is probably due to the fact that it was held to evoke the annual rains from the heavens by farmers and to bless crops.