cupbearer

n. person who fills and serves wineglasses

A cup-bearer was an officer of high rank in royal courts, whose duty it was to serve the wine at the king's table. On account of the constant fear of plots and intrigues, a person must be regarded as thoroughly trustworthy to hold this position. He must guard against poison in the king's cup, and was sometimes required to swallow some of the wine before serving it. His confidential relations with the king often endeared him to his sovereign and also gave him a position of great influence.
See more at Wikipedia.org...

Noun
1. the attendant (usually an officer of a nobleman's household) whose duty is to fill and serve cups of wine
(hypernym) attendant, attender, tender

(n.)
One whose office it is to fill and hand the cups at an entertainment.
  

(n.)
One of the attendants of a prince or noble, permanently charged with the performance of this office for his master.
  

an officer of high rank with Egyptian, Persian and Assyrian as well as Jewish monarchs. (1 Kings 10:5) It was his duty to fill the king's cup and present it to him personally. (Nehemiah 1:11) The chief cupbearer, or butler, to the king of Egypt was the means of raising Joseph to his high position. (Genesis 40:1,21; 41:9)