Memucan in Fausset's Bible Dictionary
One of the seven princes who "saw the king's face and sat
first in the kingdom" (Esther 1:13-14); "wise men who knew the
times and law and judgment." Ahasuerus accordingly consulted
them, "what shall we do unto Vashti according to law?" Memucan
as president of the council owing to his wisdom and age, or
else as an obsequious courtier knowing his master's mind, gave
his opinion first, that Vashti should be disgraced; and his
counsel the king followed.
Read More about Memucan in Fausset's Bible Dictionary