Silentiarius
Defined in 2 dictionaries — Bouvier (1914), Black's (1910)
Bouvier's Law Dictionary and Concise Encyclopedia
John Bouvier; revised by Francis Rawle · 1914
One of the privy council; an usher who saw that good rule and silence were kept in the court.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
In English law. One of the privy council; also an usher, who sees good rule and silence kept in court. Wharton.