Rabbi Yitzchak served as the official maggid or "mochiach" (admonisher) and dayan in the beis din of Brod at the time when Rabbi Yitzchak of Hamburg was serving as the town's rav.
Rabbi Yitzchak of Drovitch (Drohobich) ben Rabbi Yosef (1758 some say 1744). He was the father of Rabbi Yechiel Michel, the Maggid of Zlotschov. In later years, Rabbi Yitzchak served as the official maggid or "mochiach" (admonisher) and dayan in the beis din of Brod at the time when Rabbi Yitzchak of Hamburg was serving as the town's rav. Rabbi Yitzchak's name is specifically attached to Drohobitch, a town that lies 40 miles south of Lelov and today is a major petroleum refining center. Like many towns in this region, the town switched nationalities periodically during its history, starting off as a Ukrainian village before becoming part of Galicia. In the 14th century Drohobitch became Polish when King Kazimierz annexed Galicia to Poland. Then Austria seized the town in 1772 during a partition of Poland. Poland grabbed it back for 20 years just before World War II and, today it is once more under Ukrainian control, minus its Jewish population. In 1939 Drohobitch had about 10,000 Poles, 10,000 Ukrainians and 15,000 Jews. - See more at: https://www.yeshshem.com/hilulanissan.htm#2