Norðhymbra preosta lagu ('the Northumbrian priests' law') is an Anglo-Saxon legal text written in Old English found in the manuscript Cambridge, Corpus Christi College, MS 201, pp.
It sets out punishments for what it deems heathen practices such as a fine of five half-marks to the Church and five to the king for the holding of blót, fyrt or "idol worship".
It further forbids the making of frið-geardas (sometimes glossed as "sanctuaries") around a stone, tree or well, with the punishment being a fine paid to the landowner and the Church.
That the compensation to the landowner has been interpreted as meaning that during the time in which the laws were written, frið-geardas were typically made in secret by those of low social status.
They have been further connected with similar prohibitions in Canons of Edgar, written by Archbishop Wulfstan of York in the 11th century.