Letter of Responsum - Rabbi Mordechai Rabbi of Korets, Mechutan of the Chozeh of Lublin

Autograph letter by R. Mordechai Rabbi of Korets and of Lutsk, signed "Mordechai". [Korets, ca. early 1800s].
Halachic question regarding the writing of names on Gittin (divorce bills), sent to R. Ephraim Zalman Margolioth of Brody, author of Beit Efraim [the response to this question was printed in the Beit Efraim responsa, Hilchot Gittin, Siman 109. Noted in the index, that the responsum was sent to Korets]. In this letter, R. Mordechai mentions the previous rabbi of the city, R. Yitzchak Isaac HaCohen, author of Brit Kehunat Olam who was Rabbi of Korets: "And upon my arrival here, I have found the custom of those who arranged gittin in the days of the famed Torah scholar R. Isaac HaCohen".
R. Mordechai [Margolioth] Rabbi of Korets (died after 1822, Encyclopedia L'Chassidut, Vol. 3, p. 218) was the son of R. Pinchas Rabbi of Kolky and relative of the recipient, R. Ephraim Zalman Margolioth. He served as Rabbi of Korets from ca. 1798. His approbations appear in many books printed in his lifetime from 1798-1822 and in all the approbations, he is highly lauded which indicated his high status in his era of great Torah luminaries. Most of his approbations were for kabbalist and Chassidic books such as: Or Torah by the Magid of Mezritch, Or HaMe'ir by R. Ze'ev of Zhitomir, Kedushat Levi by R. Levi Yitzchak of Berdychiv, etc. From ca. 1816-1818, he also served as Rabbi of Lutsk while retaining his position in the Korets rabbinate. Recently, an "ohel" (tent) was constructed above his gravesite in Korets by the Ohalei Tsaddikim association (see enclosed material).
His only daughter wed R. Yosef of Lublin and of Torchin, son and successor of the Chozeh of Lublin (in his approbation to the book Or P'nei Moshe, R. Mordechai mentions his visit to the Chozeh of Lublin). His son-in-law Rebbe Yosef died at a young age in 1818,
leaving two girls. One married R. Menachem Nachum of Makariv-Chernobyl, and a long line of important Rebbes descended from her progeny.
Leaf, 22 cm. Greenish paper. 25 handwritten lines. Good condition. Minor damages to margins and slight creases. One of the words of the last line was originally written on a folding crease.
Enclosed is a report by an expert on rabbinical manuscripts, who writes about the rabbi who wrote the letter and about the item.