‘ Another Anglo-Saxon, Winfred, or Bonifacius, had been equally active among his Frisian cousins. His crozier had gone hand in hand with the battle-axe. Bonifacius followed close upon the track of
his orthodox coadjutor Charles. By the middle of the eighth century, some hundred thousand Frisians had been slaughtered, and as many more converted. The hammer which smote the Saracens at Tours was at last successful in beating the Netherlanders into Christianity. The labors of Bonifacius through Upper and Lower Germany were immense; but he, too, received great material rewards. He was created Archbishop of Mayence, and, upon the death of Willibrod, Bishop of Utrecht. Faithful to his
mission, however, he met, heroically, a martyr’s death at the hands of the refractory pagans at Dokkum. Thus was Christianity established in the Netherlands.

‘ Under Charlemagne, the Frisians often rebelled, making common cause with the Saxons. In 785, A.D., they were, however, completely subjugated, and never rose again until the epoch of their entire separation from the Frank empire. Charlemagne left them their name of free Frisians, and the property in their own land. The feudal system never took root in their soil. “The Frisians,” says their statute book; “shall be free, as long as the wind blows out of the clouds and the world stands.” They agreed, however, to obey the chiefs whom the Frank monarch should appoint to govern them, according to their own laws. Those laws were collected, and are still extant. The vernacular version of their Asega book contains their ancient customs, together with the Frank additions. The general statutes of Charlemagne were, of course, in vigor also; but that great legislator knew too well the importance attached by all mankind to local customs, to allow his imperial capitulara to interfere, unnecessarily, with the Frisian laws.

John Lothrop Motley The Rise of the Dutch Republic [1855].

‘ Under Charlemagne, the Frisians often rebelled, making common cause with the Saxons. In 785, A.D., they were, however, completely subjugated, and never rose again until the epoch of their entire separation from the Frank empire. Charlemagne left them their name of free Frisians, and the property in their own land. The feudal system never took root in their soil. “The Frisians,” says their statute book; “shall be free, as long as the wind blows out of the clouds and the world stands.” They agreed, however, to obey the chiefs whom the Frank monarch should appoint to govern them, according to their own laws. Those laws were collected, and are still extant. The vernacular version of their Asega book contains their ancient customs, together with the Frank additions. The general statutes of Charlemagne were, of course, in vigor also; but that great legislator knew too well the importance attached by all mankind to local customs, to allow his imperial capitulara to interfere, unnecessarily, with the Frisian laws. ‘
[...]
‘ The old Frisian laws consisted almost entirely of a discriminating tariff upon crimes. Nearly all the misdeeds which man is prone to commit, were punished by a money-bote only. Murder, larceny, arson, rape–all offences against the person were commuted for a definite price. There were a few exceptions, such as parricide, which was followed by loss of inheritance; sacrilege and the murder of a master by a slave, which were punished with death. It is a natural inference that, as the royal treasury was enriched by these imposts, the sovereign would hardly attempt to check the annual harvest of iniquity by which his revenue was increased. Still, although the moral sense is shocked by a system which makes the ruler’s interest identical with the wickedness of his people, and holds out a comparative immunity in evil-doing for the rich, it was better that crime should be punished by money rather than not be punished at all. A severe tax, which the noble reluctantly paid and which the penniless culprit commuted by personal slavery, was sufficiently unjust as well as absurd, yet it served to mitigate the horrors with which tumult, rapine, and murder enveloped those early days. Gradually, as the light of reason broke upon the dark ages, the most noxious features of the system were removed, while the general sentiment of reverence for law remained. ‘

John Lothrop Motley, The Rise of the Dutch Republic [1855].