Pri Megadim — Rabbi Yosef Teomim הפרי מגדים — רבי יוסף תאומים

Rabbi Yosef Teomim was born about 1727 near Lvov and died in 1792. His most fruitful years were spent in Berlin from 1772, at Daniel Jaffe's house of study; in 1774 he succeeded his father at Lvov, and from 1781 until his death he was rabbi of Frankfurt an der Oder.

Pri Megadim is not a commentary on the Shulchan Aruch but a commentary **on its commentators**, and this is a genre of its own, which he defined. On Orach Chaim: Eshel Avraham on the Magen Avraham, Mishbetzot Zahav on the Taz (Frankfurt, 1787). On Yoreh De'ah: Siftei Da'at on the Shach, Mishbetzot Zahav on the Taz (Berlin, 1771–72). The titles are constantly confused: on the Shach it is Siftei Da'at, not Eshel Avraham.

The book became common property: it is printed in all the large editions of the Shulchan Aruch, and most later decisors read the Magen Avraham and the Taz through it. His Petichah Kollelet — a statement of the general principles on which the Shulchan Aruch is built — is studied separately.