The wergeld in the popular tribal mind was a thing so fixed and so sacred that the makers of the Lex Frisionum and the Lex Saxonum were almost certain to find themselves between the horns of a dilemma.
The tribes conquered by Charlemagne, whose laws we have now to examine, differed from those whose laws and wergelds have been already considered in one important particular. They were not conquering tribes which had migrated into districts already under Roman law.
The conquests of Charlemagne over the Frisians and Saxons were conquests of German tribes settled as of old in their own countries. They were, moreover, conquests of still pagan tribes by Christian and partly Romanised Franks.
Frankish conquest had extended far into Frisian and Westphalian territory under the Merovingian kings. In Frisia Frankish influence was shown by the existence of Merovingian mints at Duurstede.[148] In Westphalia, at Soest and Paderborn, there were already Christian churches under the jurisdiction of the Archbishop of Cologne. But neither the conquest nor the conversion was completed till the time of Charlemagne.
We have already learned from Titles XXXI. and XXXVI. of the Ripuarian law that there were Frisians as well as Saxons, Burgundians, Alamanni, and Bavarians resident in the Ripuarian district. Moreover, it was directly stated that these immigrants were to be judged, not by Ripuarian law, but by their own law and custom. Further, being often isolated and without kindred near them to swear for them, if charged with crime they were to clear themselves by the ordeal of fire or lot. And finally their wergeld was stated to be 160 solidi, the inference being that this was the wergeld of the Frisian freeman in his own country, by the law and custom of which he was to be judged.
So that we approach the text of the Frisian law with this valuable earlier knowledge in our possession. Two centuries before the date to which the collection of Frisian laws is assigned, the Ripuarian law bears witness that the Frisian wergeld was 160 solidi. Even if these clauses were not a part of the original text and did not date back to the sixth century,[149] the inference would be strong, and perhaps all the stronger, that such must have been the wergeld at the later date of the Frisian law. This earlier evidence is important, as, without the clue it gives us and with nothing but the Frisian law to guide us, we might very easily have been led to a wrong conclusion.