ר' אלעזר דמן רומא

Rabbi Elazar of Rome, Rabbi Yochanan said in his name. [Yerushalmi Gittin, chapter 4, Mishnah 1; Pe'ah, chapter 5, halachah 2; Rabbi Elazar of Rome asked before Rabbi Yosi. And in Yoma, chapter 6, it is more stringent regarding the holy things of Rome].

And perhaps he is Rabbi Elazar, the son of Rabbi Yosi ben Chalafatah, who went to Rome with Rabbi Shimon bar Yochai. [However, it does not seem so, for he asked before Rabbi Yosi, and the plain Rabbi Yosi is the son of Chalafatah. And he did not know that there is a place called Rome in Eretz Yisrael, near Tzipori (see Rabbi Yosi ben Kisma and Rabbi Yaakov of Rome)].