Answer:
He proclaimed himself as the Holy Roman Emperor and spread his territory in all directions. While doing that he enter into quarrel with these two countries.
Step-by-step explanation:
Charlemagne proclaimed himself as an emperor in 800. Until then only rulers of Byzantine Empire had that title in Europe. They didn't accept this, especially as Charlemagne proclaimed himself as the successor of Roman emperors.
Abbasid caliphs fought with Charlemagne as he tried to take their territory in Spain.