This article may be expanded with text translated from the corresponding article in the German Wikipedia. (December 2009)
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Gabriel Polak and Israel Böhmer published (Königsberg, 1857) an anonymous story entitled "Ezba' Elohim," the heroes of which are Isaac Tyrnau and his beautiful daughter. According to legend, a Hungarian prince fell in love with Tyrnau's daughter, converted to Judaism, renounced the throne and married Tyrnau's daughter.
Sefer haMinhagim (Book of Customs) is a compendium of halachot ("Jewish laws") and minhagim ("customs") of Ashkenazi Jews, arranged according to the calendar. The work is significantly influenced by those of Tyrnau's teachers. It also contains notes from a Hungarian rabbi, which were already attached with the first printed edition of Tyrnau's work (1566). It is quoted by Mordechai Jaffe at the end of his "Lebush" on Orah Hayyim.
Tyrnau's work is noted as the first to discuss in detail the idea of the Yahrzeit (the commemoration of the anniversary of a death). It was translated into German in 1590, and often reprinted. It also contains a treatise on morals entitled "Orhot Hayyim," in 132 sections, which is appended to the Sefer haMinhagim.