German rabbi and mathematician; flourished in the sixteenth and seventeenth centuries. After occupying various rabbinates he settled at Padua. He wrote: "Seder Meli?ah," a treatise in Jud�o-German on the law of salting meat, at the end of which there is an elegy on the death of Abigdor Zuidal (Venice, 1602?); "Na?alat Ya'a?ob," a collection of responsa, which contains, besides his own responsa, some contributed by others (Padua, 1622); "Shoshannat Ya'a?ob," multiplication tables, with arithmetical puzzles for exercise and primary instruction (a supplement to his edition of the "Or?ot ?ayyim" of R. Eleazar ha-Gadol; Venice, 1623); an Italian translation of Benjamin Aaron Solnik's "Mi?wot Nashim," on women's three obligations (Padua, 1625). F�rst ("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").