Servitor
Defined in 2 dictionaries — Black's (1910), Abbott (1879)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
A serving-man; particularly applied to students at Oxford, upon the foundation, who are similar to sizars at Cambridge. Wharton.
Dictionary of Terms and Phrases Used in American or English Jurisprudence
Benjamin Vaughan Abbott · 1879
Messengers of the marshal of the king's bench, who were sent to serve bills or writs to summon men to court, were, in old times, called servitors of bills.