Gaius Canuleius, according to Livy book 4, was a tribune of the plebs in 445 BC.
[1] He introduced a bill proposing that intermarriage between patricians and plebeians be allowed.
As well, with his fellow tribunes he proposed another bill allowing one of the two annually elected consuls to be a plebeian.
Despite fierce opposition from the patricians, his laws were eventually passed when the plebeians went on a military strike, refusing to defend the city against its attacking neighbors.
The accuracy of Livy's description of Canuleius' tribunate and the Struggle of the Orders in which his laws played a major part is doubted by some modern scholars.