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The Laws of London, otherwise known as IV Æthelred (abbreviated IV Atr) or De institutis Lundonie, is a medieval English legal text. It has been traditionally assigned to the reign of King Æthelred the Unready (978–1016), but may represent a compilation of a later date, finalised up to a century later. The work provides an important window on, among other topics, the nature of commercial exchange and international contact in London in the tenth and eleventh centuries.

Provenance
In surviving form it is written in the Latin language, and extant only in the manuscripts of Quadripartitus, a twelfth-century legal compilation. In the nineteenth century it was categorised as the fourth set of statues surviving from the reign of King Æthelred the Unready, but in recent years it has been interpreted as representing two distinct underlying sources that each would have been intended to cover its own topic.

The first conjectured underlying source is a 'statement of London customs', one that sets out the trading rights of various foreign merchants and other city regulations. This has been labelled IV Æthelred a, abbreviated IV Atr a. Historian Rory Naismith argued that this section was likely developed between 1066 and 1100.

The second underlying source appears to consist of a series of regulations relating to currency and minting, labelled IV Æthelred b, abbreviated IV Atr b. Naismith thought that this text dated to the tenth century, either to the first half of the reign of Æthelred the Unready or perhaps even to the earlier reign of Edgar the Peacemaker (959–75).