[L. Lat. Liber Niger Scaccarii.] In English law. An ancient book in the Exchequer, containing a miscellaneous collection of charters, treaties, conventions, the number of hides of land in several counties, escuages, and the like. It is commonly attributed to Gervase of Tilbury. 1 Reeves' Hist. Eng. Law, 220, note. The Red Book of the Exchequer (q. v.) is a record of similar character. Id. ibid. [L. Lat. cancellarius de scaccario, or cancellarius et subthesaurarius scaccarii domini regis.] A high officer of the British crown, who sometimes sits in the Exchequer with the regular judges or barons of the court, where his duty is to take care of the interests of the crown. 3 Bl. Com. 44. Wharton's Lex. In this capacity, he has precedence above the barons. Brande. He seems to have originally actually exercised the functions of a chancellor, or, in the phrase of the old books, "to have been created for the qualifying of extremities in the exchequer." Cowell. And see Fleta, lib. 2, c. 27. His legal functions, however, have long been merely formal, and by the statute 5 Vict. c. 5, abolishing the equity side of the Court of Exchequer, seem now to be entirely extinguished. The most important duties of this officer concern the management of the royal revenue, he being the principal finance minister of the government. 3 Bl. Com. ub. sup. This office is commonly united to that of first lord of the treasury, when the premier happens to be below the peerage. Brande. Sec Exchequer. CHANCELLOR, Chancellare. In Scotch practice. The foreman of an assise or jury. 1 Pitcairn's Crim. Trials, part 1, p. 78. An officer mentioned in Fleta, lib. 2, c. 31.