The gemarah in Gittin, 57a, details a story of "bar d'roma" who performs miraculous feats in defending the Jews before meeting his demise by being disemboweled by a snake (similar to the end of Bar Kochba in Yerushalmi ta'anis 4:5). I cannot find a source that identifies this nameless individual with the more famous Bar Kochva but the parallels seem striking. Is there an authority who puts the two together?