Rav Yitzchok Isaac was the founder of the Komarno and Zidatshuv dynasties. He was a hidden Tzaddik; the Chozeh dressed him in white robes in the manner of the Chassidishe Rebbes of those times.
His son Rav Herschel Zidatshuver testified that his father never ate a meal without a guest at his table and never spoke one negative word against another Jew.
His five sons were: Rav Tzvi Hirsch of Zidatshuv, Rav Moshe of Samvur, Rav Alexander Sender of Komarno, Rav Yissocher Beirish of Zidatshuv, and Rav Lipa of Samvur. He also had a daughter, Perel Gittel.
Rav Yitzchok Isaac once sighed deeply. When questioned, he complained that he was unsure with what merits he would ascend to the next world after when his time came. His wife responded to him, “We will ascend through our sons –BeMesilah Na’aleh.” The acronym was the name of his renowned sons, the Tzaddikim: Beirish of Zidatshuv, Moshe of Samvur, Sender of Komarno, Lipa of Samvur, and Hirsch of Zidatshuv.
Rav Yitzchok Isaac was niftar on Rosh Chodesh Adar 5560/1800.
