Did Shakayamuni Buddha talk about the Trikaya? Did Shakayamuni Buddha talk about the Trikaya? If so where?
I am looking for suttas attributed to Shakyamuni in the times of Theravada.
It wasn't explicit in the Theravada but the foundation was already there. The concept got fully developed by the time of the Mahayana. Further info. is available from the wiki page here