Laws of Hywel Dda

Cyfraith Hywel (Welsh: [ˈkəvraiθ ˈhəwɛl]; Laws of Hywel), also known as Welsh law (Latin: Leges Walliæ ), was the system of law practised in medieval Wales before its final conquest by England. Subsequently, the Welsh law's criminal codes were superseded by the Statute of Rhuddlan in AD 1284 and its civil codes by Henry VIII's series of Laws in Wales Acts between 1535 and 1542.

Welsh law was a form of Celtic law with many similarities to the Brehon law of Ireland and particularly the customs and terminology of the Britons of Strathclyde. It was passed down orally by jurists and bards and, according to tradition, only first codified during the reign of Hywel the Good in the mid-10th century. The earliest surviving manuscripts, however, are in Latin, date from the early 13th century, and show marked regional differences. The law is only known to have been revised by a few rulers (particularly Bleddyn ap Cynfyn, who was credited with revisions retained in the kingdom of Powys) but was obviously updated by jurists in response to changing jurisdictions and circumstances, so that the surviving manuscripts cannot be considered an accurate portrayal of Hywel's first code.

Notable features of Welsh law include the collective responsibility of kindreds (Welsh: cenedl) for their members; the gavelkind inheritance of land among all and only male descendants; a status-based system of blood money (galanas); slavery and serfdom; the inability of foreigners to naturalize earlier than the fourth generation; and very lax treatment of divorce and legitimacy that scandalized the non-native clergy.

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