Hayyim Mordecai Margolioth

Hayyim Mordecai Margolioth
was a Polish rabbi, best known as the author of the halachic work Sha'are Teshuvah.
He studied under his uncle Sender Margolioth; and is the brother of Ephraim Solomon Margolioth.
He was at first Rabbi at Brestitzki, and later became Rabbi in Greater Dubno, where he established a printing press.
He was among those who elected the three deputies to confer with the government upon Jewish affairs.
He died at Dunajowce in 1818.
Sha'are Teshuvah, is a commentary to the Orach Chaim section of Shulchan Aruch and is published in most editions of the Shulchan Aruch. It contains extracts from other works – functioning as a digest of material from the responsa literature – along with the author's own insights.
It was completed posthumously by his brother.