Forced conversions: Charlemagne sought to unify his empire under Christianity and forced conquered peoples to convert to the religion, sometimes using violence and harsh measures to suppress pagan practices and beliefs.
Harsh military campaigns: Charlemagne waged numerous wars and military campaigns to expand his empire, which often resulted in significant casualties, destruction, and displacement of populations.
Suppression of dissent: Charlemagne did not tolerate dissent or opposition to his rule. He suppressed rebellions and executed or punished those who challenged his authority.
Centralization of power: Charlemagne centralized power in his hands, limiting the autonomy of local leaders and communities. This could be seen as a restriction of local rights and freedoms.
It is important to note that these negative aspects should be considered within the context of the time and the prevailing norms and values of the early medieval period. While some of Charlemagne's actions may seem harsh by modern standards, they were not uncommon or exceptional during that era.