Rabbi Shmuel Falkenfeld, better known as the Beis Shmuel Acharon, was the younger brother of Rabbi Yosef HaTzadik, the famous son-in-law of the Noda beYehuda. R’ Yosef was rav in Poznań. Around 6 months after R’ Yosef’s passing, the Poznań community decided to give over the mantle of leadership to his younger brother the Beis Shmuel Acharon.
Source: LeToledos HaKehilos BePolin, page 459.
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