The family were ministeriales in the Upper Palatinate in the service of the bishops of Regensburg. They took their name from Brennberg. There were altogether four people with the name "Reinmar von Brennberg." Which of these four was the minnesinger is not altogether clear; however, it is generally believed that the minnesinger refers to Reinmar II von Brennberg, who was documented in 1224-1236 and died between 1271 and 1275. Reinmar II was not murdered, as was depicted in the image from the Codex Manesse, but his son Reinmar III was in 1276.
Fr. v. d. Hagen, Minnesinger, Deutsche Liederdichter des 12., 13. und 14. Jahrhunderts, vol. 4, Leipzig 1838, 278ff.
Hugo Kuhn, Reimar von Brennenberg, in Carl von Kraus, Deutsche Liederdichter des 13. Jahrhunderts, 2nd edition, Tübingen 1978, Bd. 2, S. 385-396, ISBN3-484-10326-4
Frank S. Wunderlich, Wol mich des tages do mir alrerst ist worden kunt, Reichelsheim (Odenwald), Verlag der Spielleute, 2006, ISBN978-3-927240-82-7
References
Pierer's Universal-Lexikon, vol. 3, Altenburg 1857, S. 278
Hanno Rüther, Der Mythos von den Minnesängern.Die Entstehung der Moringer-, Tannhäuser- und Bremberger-Ballade, Köln, Weimar, Böhlau-Verlag, 2007, ISBN3-412-23906-2