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Rabbeinu Tam
# There were two R' Zerachiahs, one of whom was the [[Baal HaMaor]],<ref>Yad Malachi (Klalei Shear Mechabrim 13)</ref>, 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.<ref>Shem HaGedolim (Gedolim, Zayin 13)</ref>
=Rabbeinu Tam=Of course, Rabbeinu Tam is well known as Rashi's grandson, R' Yaakov ben Meir, but some Rishonim do refer to R' Yaakov author of Shu"t Min HaShamayim as "Rabbeinu Tam," as well.<ref>Shem HaGedolim (Yud 224)</ref>= Ri =
# There were two Ri Baalei HaTosafots, one of whom was the Ri, Rav Yitzchak Bar Shmuel HaZaken, nephew of Rabbeinu Tam through his sister.<ref>Yad Malachi (Klalei Shear Mechabrim 15), Shem HaGedolim (Gedolim, Yud 368). Note Haga Menachem Tzion ad loc. cites the Rama (Even HaEzer 61:3), who refers to the Ri as "Rivash."</ref> The other is the Ri HaLavan or Ri HaBachur mentioned above (see Riva).
 
=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.<ref>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</ref>

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