Its starting point is the Rolls of Oléron, which were promulgated in c. 1160 by Eleanor of Aquitaine, although the Black Book is undoubtedly later.
[1] Apart from the Rolls of Oléron, the earliest statute referred to is the Liber memorandorum (1338), of which a separate manuscript copy is available in the archives of the City of London.
[1] The book is written in Old French and its authors change handwriting and tone various times.
The earliest surviving manuscript copy dates from c. 1450, and is held in the National Archives.
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