The museum is currently the custodian of the town’s charters and corporation records. Of the 120 charters and associated documents 81 date from before 1500. The earliest datable document is the charter of Henry De Lacy, Baron of Halton and later Earl of Lincoln, written in 1272. This allowed the men of Congleton the right to hold land through the payment of a money rent rather than by personal service to the Lord of the Manor. It also gave the inhabitants of the town to elect a Mayor.
Initially legal documents, these charters are also works of art. The most decorative is the 1625 charter of James I Seal.
The earlier Elizabethan Charter of 1583, although not colourful, is equally as decorative.
The Congleton Corporation records also include minute or order books and accounts which date from the mid 16th century.
There are documents which reflect different aspects of the town’s history. These include sale catalogues, land deeds, letters and slum clearance records.