רב אידי בר אבין

Rabbi Idi bar Avin was a naggar [(in the name of)] his wife, a kohenet. He is mentioned in the section "These are the ones who are liable" [(Mishnah Niddah 49a) and he ate for the sake of his wife, who was a chalal (Chullin 132a) and his brother Rabbi Chiya]. From him emerged two students of semichah: Rabbi Sheshet [(and in some places Rabbi Shisha)] and Rabbi Yehoshua. The Gemara raises a difficulty regarding the students of semichah, as it is possible that in their time semichah was nullified or that he was in Babylonia and did not go to Eretz Yisrael.

However, they were worthy of semichah and he instituted it in Narsai. [He sent before Abaye in Bava Batra (32b) and said to Abaye in Bava Metzia (35b), "What is the reason? (16a)"] Abaye said to him [Chullin (97b) and Rabbi Huna bar Rabbi Yehoshua (above)]. He sat before Rabbi Chisda and said to Rabbi Chiya, "This teaching is in accordance with you" based on (Kiddushin 101b). Rabbi Chisda said in Eruvin (59b) in Bava Metzia (4a).

He came to judgment before Rabbi Chisda and said, "Regarding Rabbi Chiya, this is what is said about him: 'He is a great man'—'Master, your semichah is from this'..." (Also regarding this, he sat before him and came to judgment before him and said in his name, it seems that he is a student of Rabbi Chiya, and Rabbi Chiya called him 'Master'—a general principle that a teacher does not call his student 'Master') in Bava Batra (33a).

Rabbi Chisda said, "Thus we have taught in the Mishnah about a child" [(in the name of)] the son of Rabbi Karna. Rava bar Ahi said to Rava, "His son." Rabbi Abba bar Ahu said, "Rabbi Amram said, Rabbi Yitzchak said, Rabbi Yochanan" [(in the name of)]. The genealogies were written [in the order of the Amoraim of their times, the seventh generation], and it is written in the generations of the world that Rabbi Idi bar Avin was the head after Marimar.

I do not know who he is; if he is the one who was in the days of Rabbi Chisda, he would be close to two hundred years ago, only they are years, thus far. And see part one, D'varim Kitzuv 132 that he ruled for seven years.