1.
Moidhy asks:
Who is the Avi Ha'Ezri quoted at the end of tosafos pesachim 100b DH Yedai Kidush Yatz'u?
Moidhy, Brooklyn, USA
2.
The Kollel replies:
Shalom Moidhy,
It's great to hear from you! The Avi ha'Ezri quoted in Tosfos is Rabeinu Eliezer ben Yoel ha'Levi, also known as the Ra'avyah, whose Halachic Sefer is named "Avi ha'Ezri." He was one of the Gedolei Torah in Germany around 700 years ago. A number of Ba'alei ha'Tosfos were contemporaries of his.
Bi'Verachah,
Yishai Rasowsky