It was likewiſe cuſtomary to drink hard at theſe kinds of feaſts; yet it ſeems, according to the ſame author [Posidonius], that the coryphee, or head-gueſt, always began firſt, and put the cup, or rather pitcher, about to his next neighbour, till it had gone round: for, it ſeems, they all drank out of the ſame veſſel, and no man could drink till it came to his turn, nor refuſe when it did.
Source: wiktionary