Why was Charlemagne a strong ruler

he took over territories he would allow Frankish nobles to rule them. However, he would also allow the local cultures and laws to remain.

Explanation:

Charlemagne became king of the Franks, a Germanic tribe in present-day Belgium, France, Luxembourg, the Netherlands and western Germany. Charlemagne spent the early part of his reign on several military campaigns to expand his kingdom. He invaded Saxony in 772 and eventually achieved its total conquest and conversion to Christianity.

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explanation:

the right answer for the question that is being asked and shown above is that: "their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.  " the  participant in european imperialism is being described below is that  their policy of "divide and rule" pitted political groups against each other to keep any one group from becoming too powerful.