German rabbi and mathematician; flourished in the sixteenth and seventeenth centuries. After occupying various rabbinates he settled at Padua. He wrote: "Seder Meliḥah," a treatise in Judæo-German on the law of salting meat, at the end of which there is an elegy on the death of Abigdor Zuidal (Venice, 1602?); "Naḥalat Ya'aḳob," a collection of responsa, which contains, besides his own responsa, some contributed by others (Padua, 1622); "Shoshannat Ya'aḳob," multiplication tables, with arithmetical puzzles for exercise and primary instruction (a supplement to his edition of the "Orḥot Ḥayyim" of R. Eleazar ha-Gadol; Venice, 1623); an Italian translation of Benjamin Aaron Solnik's "Miẓwot Nashim," on women's three obligations (Padua, 1625). Fürst ("Bibl. Jud." 1:371) doubts whether the Italian translation was made by Heilbronn or whether the latter was the author and Solnik the translator. The Italians spell his name "Alpron" (Mortara, "Indice").