[2] A native of Travale in Tuscany, he possessed several castles in the region, among them Elci, Giuncarico, Montalbano and Montingegnoli.
[2][3] With Albertino of Canossa and Pietro Vento, he was part of the council of the regent of Thessalonica, Oberto of Biandrate, that received the ambassadors of the Latin emperor Henry.
[2] He participated in the Second Parliament of Ravennika, where he supported Biandrate, and was one of ten barons of Thessalonica who signed the concluding convention of 2 May 1210.
[2] In the aftermath of Henry's invasion of Thessalonica in 1209–1210, Rainerio entered imperial service.
[1][2] He probably returned to Greece in the expedition of Demetrius of Thessalonica and William VI of Montferrat in 1225, which ended in failure.