Their legal discussions and debates were eventually codified in the Gemara. The Amoraim followed the Tannaim in the sequence of ancient Jewish scholars. The Tannaim were direct transmitters of uncodified oral tradition; the Amoraim expounded upon and clarified the oral law after its initial codification.
Among the earliest Amoraim in Israel were Rabbi Yochanan and Shimon ben Lakish. Traditionally, the Amoraic period is reckoned as seven or eight generations (depending on where one begins and ends). The last Amoraim are generally considered to be Ravina I and Rav Ashi, and Ravina II, nephew of Ravina I, who codified the Babylonian Talmud around 500 CE.
Source: Wikipedia > Amora
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