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My question is very simple and straightforward: does anybody know who authored the Torah commentary, Daat Zkeinim (דעת זקנים)? I know that it was written by some of the Baalei haTosafot, but would very much like to know who.

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Unsurprisingly, Rabbeinu Tam is one I believe. There is a Daas Zekeinim on the words, "Vayifga bamokom etc" which fits with Rabbeinu Tam's view about early Maariv in Gem. Brochos d.h. mai-aimosai. – Avrohom Yitzchok Dec 23 '12 at 12:17
Related: judaism.stackexchange.com/q/17347/1569 – b a Dec 25 '12 at 2:45

According to this page, the author is unknown. However, earlier in the book (fn. 2), he says that it was first printed in Livorno 5543, if that helps you.

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