E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Bedlam.
A lunatic asylum or madhouse; a contraction for Bethlehem, the name of a religious house in London, converted into a hospital for lunatics.
1
Tom o Bedlam. (See TOM.)
2
St. Mary of Bethlehem, London, was founded as a priory in 1247, and in 1547 it was given to the mayor and corporation of London, and incorporated as a royal foundation for lunatics.