Rabbinical eras
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Rav Aha bar Jacob (or R. Aha bar Ya'akov; Hebrew: רבי אחא בר יעקב) was an Babylonian rabbi of the third and fourth generations of Amoraim.

He was one of the disciples of Rav Huna.^[1] He was also one of the prominent Jewish leaders of Papunia.^[2] In the Talmud it is said that he was a man of great piety and a great scholar.^[3]

References

^ Babylonian Talmud, Yebamoth 64
^ Babylonian Talmud, Hullin 17
^ Sukkah 38; Erubin 63

Amoraim

Amoraim of Eretz Israel
First Generation (until 250 CE):	Gamaliel III R. Hiyya Rabbi Yannai Hoshaiah Rabbah Epes the Southerner Joshua ben Levi Hanina bar Hama Levi ben Sisi Bar Kappara Jeremiah (I) Simeon ben Jehozadak Simeon ben Judah ha-Nasi
Second Generation (until 280 CE):	Judah II (Nesi'ah I) Johanan bar Nappaha Shimon ben Lakish Eleazar ben Pedat Isaac Nappaha Jose bar Hanina Rav Kahana II Jacob bar Idi Hezekiah Judah b. Hiyya Abba of Jaffa Hama bar Hanina Shimon bar Abba Simlai Hillel, son of Gamaliel III Zeiri
Third Generation (until 310 CE):	Gamaliel IV Rabbi Ammi Rabbi Assi Abbahu Ulla Rabbi Yitzchak Zeira Helbo Samuel ben Nahman Abin I Hiyya bar Abba Rabbah bar bar Hana Levi II Rabbi Ilai II Abba bar Kahana Rav Avira Hanina bar Papi Hanina ben Pappa Jose of Yokereth Jeremiah (II) Hoshaiah II Hanina Abba bar Memel Tachlifa of the West Avdimi of Haifa Luliani ben Tabrin Abba of Acre Shimon ben Pazi Me'asha Shila of Kefar Tamarta Anani ben Sason Alexandri Kahana bar Tahlifa
Fourth Generation (until 340 CE):	Judah III (Nesi'ah II) Jeremiah (III) Rabbi Aha Rabbi Berekhiah Jose bar Zevida Rabbi Jonah Rabbi Hilkiah Zerika Isaac ben Eliashiv Rabbi Aibu Hasa of Eshtemoa Abba bar Hiyya bar Abba Rabin Abba bar Zemina Pedat ben Eleazar Abba bar Pappai Acha bar Hanina
Fifth Generation (until 380 CE):	Hillel II Gamaliel V Jose ben Abin Rabbi Mana II
Sixth Generation (until 410 CE):	Judah IV (Nesi'ah III) Tanhuma bar Abba Hanina of Sepphoris Samuel b. Jose b. Boon

Amoraim of Babylon
First Generation (until 250 CE):	Abba Arikha (Rav) Samuel of Nehardea Mar Ukva Karna Rav Shela Rav Assi Abba bar Abba
Second Generation (until 280 CE):	Rav Huna Judah bar Ezekiel Hamnuna II Hamnuna Saba Rabbah bar Abuha Jeremiah bar Abba Rav Kahana II Rav Berona Hiyya bar Joseph Rav Giddel Hiyya bar Ashi Raba Bar Jeremiah (Abba) Adda bar Ahavah Anan
Third Generation (until 310 CE):	Rabbah bar Nahmani (Rabbah) Rav Nachman Sheshet Rav Chisda Hamnuna III Rav Yosef bar Hiyya Rabbah bar Rav Huna Joseph bar Hama Ammi b. Abba Rav Shmuel bar Yehudah Rav Shmuel bar Rav Yitzchak
Fourth Generation (until 340 CE):	Abaye Rava Rami bar Hama Aha bar Jacob Rav Safra Rav Kahana III Idi b. Abin Naggara Hiyya b. Abin Naggara Mar son of Ravina Rav Shizbi Isaac b. Judah Rabbah b. Shela Mari bar Rachel Acha Bar Yosef
Fifth Generation (until 380 CE):	Rav Nachman bar Yitzchak Rav Papa Rav Papi Huna ben Joshua Rav Zevid Amemar Mar Zutra Rav Mesharshiya Hanina of Sura Bevai bar Abaye
Sixth Generation (until 430 CE):	Rav Ashi Ravina I Maremar Rami b. Abba Huna bar Nathan Rav Kahana IV Sama bar Raqta
Seventh Generation (until 465 CE):	Rav Yemar Mar bar Rav Ashi Rafram II Aha b. Rava Judah b. Meremar
Eighth Generation (until 500 CE):	Rabbah Tosafa'ah Ravina II Rabbah Jose Rav Rahumi III Samuel b. Abbahu