| Mar R. Yaakov haKohen of Nehar Pekod | Iraq | fl. 712-730 |
| R. Yaakov haKohen ben Mar R. Mordechai Gaon | Iraq | fl. 768-812 |
| R. Moshe ben Mar R. Yaakov Kahana | Iraq | fl. 830-841 |
| R. Yaakov ben Natronai Gaon | Iraq | fl. 911-923 |
| R. Yom Tov Kahana ben Mar R. Yaakov Gaon | Iraq | fl. 923-927 |
| R. Yaakov ben Nissim | Kairouan, North Africa | 10th cent. |
| R. Nissim ben Yaakov (son of the above) | Kairouan, North Africa | died c. 1050 |
| back to 6th-11th c. |
| R[eb] Yaakov b[en] R[eb] Yekusiel | France, and Rome, Italy | fl. 1007 |
| Mar Yaakov b[en] R[eb] Sulam | Mainz, Germany | d. 1096 |
| R[eb] Eliezer b[en] R[eb] Yaakov | Mainz, Germany | 1096 |
| Hillel b[en] Yaakov | Bonn, Germany | 12th c. |
| Ephraim ben Yaakov Yelivah | Germany | b. 1132 |
| Rabbenu Yaakov | France | fl. 1147 |
| HaRav HaMuvhak R. Yaakov meOrleans | England | d. 1190 |
| Menachem b[en] Rabbi Yaakov | Worms, Germany | late 12th c. |
| Yaakov | Mainz, Germany | 1195 |
| R[eb] Yaakov b[en] R[eb] Avraham | Wissembourg, France | d. 1270 |
| R[eb] Yaakov b[en] haR[av] Yehudah miYelutra | Troyes, France | 1288 |
| Yechiel b[en] Rabbi Yaakov | | 13th c. |
| Moshe b[en] R[eb] Yaakov | Germany | 13th c. |
| back to Crusades |