In 68, as his reign became increasingly insecure, Nero raised "legio" I "Adiutrix" from sailors of the praetorian fleets. After Nero's overthrow, in 69, the "Year of the four emperors", the praetorian fleets supported Emperor Otho against the usurper Vitellius, and after his eventual victory, Vespasian formed another legion, "legio" II "Adiutrix", from their ranks. Only in the Pontus did Anicetus, the commander of the "Classis Pontica", support Vitellius. He burned the fleet, and sought refuge with the Iberian tribes, engaging in piracy. After a new fleet was built, this revolt was subdued.