Hovevei Zion
Ruben Bierer (Dr. "Rubin Bierer", often: "Reuben Bierer"; born c. 1835 in Lviv; died 1931 lviv.) was a doctor in Sofia and one of the first pioneers of the Jewish nationalism and one of the first active zionists in Galicia and Bulgaria, adherent of Hovevei Zion in Galicia, Austria and Bulgaria.