The session sends representatives to the next level higher council, called the "presbytery" or "classis". Mainz was also a base of a Roman river fleet, the Classis Germanica. Each flotilla was commanded by a "praefectus classis" who reported to the local "dux". The synod deals only with issues raised by a classis. It was given the honorary title classis pia fidelis Domitiana. The "classis Germanica" rendered outstanding services in multitudinous landing operations. Below the prefect rank was the "praepositus classis", each fleet usually having two of them. Labels are&colon; EMI Classics, Warner Classis, Avi-music and Deutsche Grammophon. The industry is thought to have been organised by the "Classis Britannica", the Roman navy. Only in the Pontus did Anicetus, the commander of the "Classis Pontica", support Vitellius. He also served as an elder and supply preacher for the classis of Amsterdam. In 1976 the first Classis were formed. As well as replacing the classis Enviro200, it also superseded the Enviro300. A majority of the PRCA's Classis East churches, about 13 congregations, are around Grand Rapids. On April 8, churches in Graafschap and Polkton also left the Classis of Holland.