Germanic kingship is a thesis regarding the role of kings among the pre-Christianized Germanic tribes of the Migration period Wikipedia

The barbarian kingdoms, also known as the post-Roman kingdoms, the western kingdoms, or the early medieval kingdoms, were the states founded by various non-Roman, primarily Germanic, peoples in Western Europe and North Africa following the collapse of the Western Roman Empire in the fifth century. Wikipedia

Thesis regarding the role of kings among the pre-Christianized Germanic tribes of the Migration period Wikidata

Series of medieval kingdoms founded and dominated by northern European tribes after the collapse of the Western Roman Empire in 476 Wikidata