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I'm gonna throw this out there and see if it sticks. Today is the Yohrtzeit of RYY of Avrutch, grandfather and namesake of the Frierdige Rebbe and son of the Tzemach Tzedek. He was married to Chana, daughter of Rav Yaakov Yisroel of Tcherkas and, you might say, defied his father and went to accept a rabbonus and a derech against his father's wishes. He became a Rebbe b'derech Tchernobel. Chabad-Lubavitch archives, publicized, via their FB page, a picture some time ago that has an inscription that reads "Itzhak-Joseph Shneerson." Can it be that the picture is either of the Avrutcher or his son Reb Nochem Dov? Here are the תולדות of the Avrutcher from Heichel HaBesht. באדיבות קובץ היכל הבעש"ט
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