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I don't know much about this but according to Wikipedia (here and here) it was Ananda who narrated the stories in the suttas.
A council of 500 Arahats was held at Rajgir (Sanskrit: RΔjagaha) to agree the contents of the Dhamma and Vinaya. Ananda recited the Suttas, such that each begins: βThus have I heardβ.
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Most of the back stories are included in the commentaries. For English readers I recommend Mr. Piya Tan's translations and commentaries which are available at www.dharmafarer.org