What is "board" in "Highest rabbi board of the Great synagogue of Vilnius"?
Highest rabbi board of the Great synagogue of Vilnius was considered one of the most important institutions of the Jewish community
com/definition/us/board ). The text that you are reading appears not to have been written by a native English speaker and contains various errors and odd phrasings.
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Presumably "board" is used in the sense of "group of people constituted as the decision-making body of an organization" (sense 3 at https://en.oxforddictionaries.com/definition/us/board).
The text that you are reading appears not to have been written by a native English speaker and contain