Norman law (Norman: Coûteume de Normaundie, French: Coutume de Normandie, Latin: Lex Normanica) refers to the customary law of the Duchy of Normandy which developed between the 10th and 13th centuries and which survives today in the legal systems of Jersey and the other Channel Islands. It grew out of a mingling of Frankish customs and Viking ones after the creation of Normandy as a Norse colony under French rule in 911.
There are traces of (Anglo-)Scandinavian law in the customary laws of Normandy. A charter of 1050 (Cartulaire Saint-Pierre-de-Préaux, concerning the land of Vascœuil), listing several pleas before Duke William II, refers to the penalty of banishment as ullac "(put) out of law" (from Old Norse útlagr "(be) banished"), well attested in the Norwegian and Anglo-Saxon laws as utlah and those sentenced for ullac are called ulages (< útlagi "outlaws"). The word was still current in the 12th century, when it was used in the Roman de Rou by Wace. Another word mentioned in the same charter is hanfare (or hainfare, haimfare, hamfare < Old Norse heimför) which punishes the offense of invasio domus, known mainly in England as hamsocn. In the Très ancien Coutumier (1218 - 1223) this crime is called in Latin assultus intra quatuor pertica domus "assault inside the house".