This series originally contained maps and plans created or accumulated by the Duchy of Lancaster, relating to estates in England. Some had been transferred or extracted to this series from records in DL 3 and DL 4: these were made principally in the elucidation of the claims of parties in disputes heard before the Court of Duchy Chamber.
All pieces in this series have been transferred to map extract references, in the series MFC 1, MPC 1, MPCC 1 and MR 1 They are described fully under those references.