Who is the רנב"י quoted by the Shitta Mekubetzet to Nedaarim (8a s.v. אמר רב גידל)?
Could it be R. Nissim ben Yaakov Gaon?
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In the Shitta Mekubetzet, רנב"י stands for R. Natan bar Yosef. He was a student of the Ramban, and wrote a commentary to an older work from the Ramban on the laws of vows.