Ruse (also transliterated as Rousse, Russe; is the fifth largest city in Bulgaria. Russe (called Rustchuk in the past) is situated in the northeastern part of the country, on the right bank of the Danube, opposite the Romanian city of Giurgiu. Archeological remains prove the existence of a Jewish presence from the 2nd century (CE). The Jewish population was first composed of Romaniote Jews. Then Jews from Hungary and Germany settled there and, after the Expulsion from Spain, Sephardic Jews who found refuge in the Ottoman Empire settled in various cities of Bulgaria, Russe included. But the community began to really flourish by the end of the 18th century. The Jewish population of Russe reached 4,000 souls at its maximum.
https://en.wikipedia.org/wiki/Ruse,_Bulgaria https://www.jewishgen.org/Communities/community.php?usbgn=-837975