<human>:  I have a question about the history of Buddhist modernism. Where did the idea of a reincarnated Buddha come from?
<bot>: The idea of a reincarnated Buddha is a very old one. It was first mentioned in the Pali Canon, which was written down in the 4th century CE. The idea of a reincarnated Buddha is based on the belief that the Buddha is not a single person, but rather a series of enlightened beings who have lived and died.