How was it known as that devanam piyadasi and ashoka were the same person?

Devanam Piyadasi is a title attributed to Emperor Ashoka, which means "He who is beloved of the gods." This identification is supported by inscriptions found on pillars and edicts throughout his empire, where he refers to himself as Devanam Piyadasi. Historical texts and Buddhist traditions also link Ashoka's reign with the promotion of Buddhism and his efforts to spread Dharma, reinforcing the connection between the two names. Additionally, the timeline of Ashoka's rule corresponds to the period when these titles were used.