Sefer Nizzahon Yashan
Sefer Nizzahon (Yashan) (Hebrew: ספר ניצחון, romanized: sēfer niṣṣāḥon, lit. 'Book of Victory') "The (Old) Book of Victory" is an anonymous Jewish apologetic text that originated in 13th-century Germany. The word "old" (yashan) has become attached to the title to distinguish the work from the Sefer Nizzahon of Yom-Tov Lipmann-Muhlhausen of Prague, written in the 15th century.