Disambiguations of Rishonim
Often times, two contradictory statements of a Rishon will baffle the Poskim, and all it takes is a little history to know that there were actually two or more people with the same name, each of which said one of the contradictory statements.
- Rabbeinu Yitzchak ben Yaakov Alfasi, the Rif, had a grandson, Rav Yitzchak ben Reuven, who is known as the Baal HaShe'arim. Some Poskim weren't aware of this and mistakenly posed contradictions between the writings of the two.
It's important to be aware that there are three individuals known as the Ra'avad:
- R' Avraham ibn Daud of Spain, author of Sefer HaKabbalah
- R' Avraham ben Yitzchak Av Beit Din of Narbonne, who wrote the Sefer HaEshkol
- His son in law, and R' Avraham ben David of Posquières, author of the Hasagot on the Baal HaMaor and Rambam, Baalei HaNefesh, and quoted extensively by Rishonim.
There were at least four Rabbeinu Yonahs:
- R' Yonah Gerondi (HeChassid), whom we know as Rabbeinu Yonah, cousin of the Ramban, and Rebbe of the Rashba. His grandson, son of his daughter and the Ramban's son Shlomo, was named R' Yonah after him. He had grandson who was also named R' Yonah, whose daughter married the Rashbetz and was thereby the grandfather of the Rashbash.
- R' Yonah שניין, a cousin of the R' Yonah Gerondi, who overlapped in his lifetime.
- R' Yonah author of the Sefer Issur veHetter and Talmid of the Terumat HaDeshen. Printers and Poskim mistakenly labeled his Sefer as a product of R' Yonah Gerondi, but it's clearly impossible.
- Sefer HaTerumah was written by R' Baruch MiRegensburg, the student of R' Eliezer MiMitz, R' Baruch MiMagence, who wrote Sefer HaChochmah.
- There were two R' Zerachiahs, one of whom was the Baal HaMaor,, and the other was R' Zerachiah HaYevani, who wrote the Mussar work, Sefer HaYashar. He should not be confused with Rabbeinu Tam, who also wrote a Sefer HaYashar on Shas and Shu"t.
- There were two Ri Baalei HaTosafots, one of whom was the Ri HaZaken, nephew of Rabbeinu Tam.
R' Asher (Rosh)
- The Rosh quoted by the Baal HaTerumot, Mordechai, Hagahot Maimoniot, and Kol Bo is Rabbi Asher MiLunell, not Rabbi Asher Ben Yechiel of Toledo, as the latter lived much later.
- Yad Malachi (Klalei HaRif 20)
- Shem HaGedolim (Gedolim, Aleph 9-11). See Shach Choshen Mishpat 39:2
- Shu"t HaRashbash Siman 291
- Yad Malachi (Klalei Shear Mechabrim 14), Hagahat R' Tzvi Hirsch Berlin ad loc based on Beit Yosef Choshen Mishpat 388. See Shem HaGedolim, Gedolim, Yud 98)
- HaRav Hershel Schachter (Vayakhel-Pekudei 5778, Tetzaveh 5777), Rav Meir Mazuz (Ohr Torah Iyyar 5777 Siman 86)
- Yad Malachi (Klalei Shear Mechabrim 12), Shem HaGedolim (Gedolim, Bet 46). See Chaim She'al 1:69, Matnat Yado ad loc. and Moriah Kovetz 143 page 3
- Yad Malachi (Klalei Shear Mechabrim 13)
- Shem HaGedolim (Gedolim, Zayin 13)
- Yad Malachi (Klalei Shear Mechabrim 15)
- Yad Malachi (Klalei Shaar HaMechabrim 1), Matnat Yado fn. 1-2, Shem HaGedolim (Gedolim, Aleph 237). See Shach (Choshen Mishpat 107, Yoreh Deah 105:2) and Sdei Chemed Klalei HaPoskim 15:25