Answer:
d. charlemagne
Explanation:
Charlemagne was also known as Charles the Great, was a Frank emperor from the 768 till his death in 814, he conquered and united western europe under his reign, he conquered the germanic regions, the lombards, and went on a brutal campaign against the Saxons, which were a pagan tribe, he swore to convert to christianity and to convert the whole of his reign, anyone who didn´t get baptized would be sentenced to death under his reign.
