Most of this series consists of assize rolls on which are recorded proceedings of sessions held in the Palatinate of Lancaster under commissions of assize, gaol delivery and oyer and terminer. The main sequence runs from 1660 to 1843 with some earlier rolls from between 1525 and 1546.
From the early 19th century the rolls contain little more than a recital of the commissions; proceedings of sessions can be found in Crown minute books instead.
The first five pieces are not assize rolls. They are 'memorandum negociorum', 1-14 and 20-30 Henry VI, which summarise Crown business at sessions and act as a means of reference to plea rolls for those years; rolls of fines, 20 and 22 Henry VI; and a roll listing felons delivered, 5-17 Edward IV.