In 1205, Ravano was among those who led forces in the capture of the island of Euboea from the Byzantine Empire as part of the Fourth Crusade.
The Republic of Venice recognised his independence as Lord of Negroponte and he accepted Venetian suzerainty in March.
Later in the year he foiled the conspiracy of Oberto II of Biandrate, his former ally, who had planned to take the life of the Emperor Henry.
Ravano had agreed to marry Isabella, the wife of another man, sometime prior to 25 May 1212, when, after she was widowed, the Archbishop of Athens received dispensation from Pope Innocent III to perform the marriage.
Ravano made no provision for his principality in light of his death and it was left to the Venetian bailiff to divide Euboea into sixths in 1217.