What is Black Book Of The Exchequer?

Legal Definition
The name of a book kept in the English exchequer, containing a collection of treaties) conventions, charters, &c.
-- Bouviers Law Dictionary
Legal Definition
The name of an ancient book kept in the English exchequer, containing a collection of treaties, conventions, charters, etc.
-- Black's Law Dictionary
Legal Definition
A book in the English exchequer containing treaties, conventions and charters.
-- Ballentine's Law Dictionary