Judicia civitatis Londoniae

The Judicia civitatis Londoniae or Dooms of the City of London is a compilation of laws and customs from 930 granted by Æthelstan that governed the City of London. It tried to get the peace or frith guilds, associations with a corporate responsibility for the good conduct of their members and their mutual liability, to unite although the Knighten Guilde was not included. Also involving the bishops and reeves of London, guild law came to be the law of the City of London.
Guild members were expected to be involved in almsgiving, caring for their sick, burial of the dead, and providing Masses for the souls of deceased members. There was also a monthly feast. As well as the religious and social practices there were also commercial aspects including insurance against losses and assistance in catching thieves. This foreshadowed later English Gild Merchants.