symposiarch

The symposiarch, or arbiter bibendi, settled the proportions to be used.

Olympius had risen from his place as Symposiarch and was leaning against a door-post awaiting death with manly composure.

And now, said the Emperor, you must all obey your symposiarch, and I am going to tell you each in turn what to do.

They have their absolute ruler, the symposiarch, their accepted order of drinking, their proper scale of fines.