Capitulatio de partibus Saxoniae

Capitulatio de partibus Saxoniae (Latin "Ordinances concerning Saxony") was a legal code issued by Charlemagne and promulgated amongst the Saxons during the Saxon Wars. Traditionally dated to Charlemagne's 782 campaign, and occasionally to 785, the much later date of 795 is also considered possible. Despite the laws, some Saxons continued to reject Charlemagne's rule and attempts at Christianization, with some continuing to rebel even after Charlemagne's death (such as the Stellinga uprising).

Many of the laws of Capitulatio de partibus Saxoniae are focused on the Christianization of the pagan Saxons, including a sentence of death for Saxons who refuse to be baptised:

Scholar Pierre Riché refers to the code as a "terror capitulary" and notes that the Massacre of Verden, in which Charlemagne ordered 4,500 imprisoned Saxons massacred in 782, may be seen as a preface to the legal code.

...
Wikipedia