What is Brevibus Et Rotulis Liberandis?

Legal Definition
Eng. law. A writ or mandate directed to a sheriff, commanding him to deliver to his successor the county and the appurtenances, with all the briefs, rolls, remembrances, and all other things belonging to his office.
-- Bouviers Law Dictionary
Legal Definition
A writ or mandate to a sheriff to deliver to his successor the county, and ap-purtenancos, with the rolls, briefs, remembrance, and all other things belonging to his office. Reg. Orig. 295.
-- Black's Law Dictionary