The records in this series are lists of knights' fees returned to, and created in, the Chancery of the Duchy of Lancaster.
Many of these lists were created by the feodaries, officers responsible for the incidents of feudal tenure, such as relief, homage and aids. The lists, reflecting their purpose, are limited and simply note the holders of knights' fees by name in each manor, village or township in the honor or county concerned.
There are also many compilations of lists and transcripts of material plundered from other sources, especially the Red Book of the Exchequer and the Liber Feodorum, or Testa de Nevill.
As well as lists of knights' fees this series includes other related documents. There are accounts relating to the collection of aids on the knighting of the son of Henry, Earl of Lancaster in 1330 and on the marriage of Henry IV's daughter, Blanche, to Louis, the son of Emperor Rupert in 1402.
There are also court rolls of the manor of Arkesdon, Essex, part of the honor of Walbrook and two 'valors' of Henry, Earl of Lancaster dated 1330-1332.