German rabbi and tosafist; martyred at Bacharach in 1283. He was an uncle and teacher of Meïr of Rothenburg and a pupil of Abraham Hladik, the Bohemian Talmudist. He succeeded his father in the rabbinate of Magdeburg; but, as a part of the community objected to his nomination, the intervention of Moses Taku (=Tachau) was necessary to remove the difficulties. He corresponded with Isaac Or Zarua', who calledhim "Baḥur" (young man), but spoke of him very highly ("Or Zarua'," , No. 114) to Abigdor ha-Kohen (Mordecai to Giṭ. No. 380) and to R. Jehiel of Paris ("Teshubot MaHRaM," No. 590). He is quoted also by many authors of responsa, by Israel Isserlin ("Terumat ha-Deshen," No. 233), by Israel of Kremsier in his "Haggahot ha-Asheri" (Mordecai to Ket. No. 291), and especially by Mordecai b. Hillel. Hezekiah wrote a commentary on the Talmud (Mordecai to Ḳid. No. 510; idem to B. Ḳ. No. 174), besides tosafot ("Haggahot Mordekai," Shab. No. 282) and responsa (Solomon b. Adret, Responsa, , No. 28).