Issamar of Nadvorna
Nadvorna Rebbe
Grand Rabbi Isamar Rosenbaum "The Elder"
of Nadvorna
Term 1902 – 1973
Full name Issamar Rosenbaum
Born 1886
Died 1973
Buried Mount of Olives
Dynasty Nadvorna
Predecessor Meyer Rosenbaum
Father Meyer Rosenbaum
Wife Malka Rubin
Issue 3 .

Rabbi Isamar Rosenbaum (1886-1973) was a Hasidic rebbe, and the progenitor of the extended Hasidic dynasty of Nadvorna and Kretshniff. He was the son of Rabbi Meyer Rosenbaum of Kretshniff, who in turn was a son of Rabbi Mordechai of Nadvorna.

Isamar Rosenbaum became a rebbe at the age of sixteen and, at his father's behest, moved to Czernowitz where he served as a chasidic rebbe. In the Nadvorna dynasty, all children of the rebbes open their own chasidic courts, even during their fathers' lifetime. His wife, Rebbitzen Malka, was the daughter of Rebbe Usher Yeshaya Rubin of Kolbuszowa, Galicia.

His family was the only chasidic family of grand rabbis known to have all survived the Nazi camps with the whole family intact.

In 1969 (20 Marcheshvon 5730), Rebbetzen Malka died; she was brought to Tveria for burial.

In 1970, three years before his death, he moved from the Washington Heights neighborhood of Manhattan to Yad Eliyahu in Tel Aviv, Israel.

At the time of his death, he was one of the longest living chassidic rebbes in history; he was known as the Admor Hazaken miNadvorna, or "Elder Rebbe of Nadvorna".

He died at the age of 86 in 1973 (Sivan 5733) and laid to rest in the Mount of Olives.

All his sons and sons-in-law, were chasidic rebbes, with the sole exception of his son Rabbi Meyer Rosenbaum, who was the Chief Rabbi of Cuba, and a prolific author of scholarly works, including Torah LeOhr Hatekufah.

Preceded by
Rabbi Meyer Rosenbaum of Kretchniff
Rebbe of Nadvorna
Succeeded by
Grand Rabbi Chaim Mordchai of Nadvorna

Grand Rabbi Yisochor Ber of Strozhnitz

Grand Rabbi Yitzchak Isaac of Zutshka

'Grand Rabbi Usher Yeshaya of Nadvorna-Chadera

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