Examples of regna in the following topics:
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- The Carolingians had the practice of making their sons minor kings in the various regions (regna) of the Empire, which they would inherit on the death of their father.
- Following the death of Louis the Pious (Charlemagne's son), the surviving adult Carolingians fought a three-year civil war ending only in the Treaty of Verdun, which divided the empire into three regna while according imperial status and a nominal lordship to Lothair I.
- The Carolingians were displaced in most of the regna of the Empire in 888.
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- Outside this was the regna, where Frankish administration rested upon the counts, and beyond regna were the marcher areas, ruled by powerful governors.