His father was Pepin the Short, the Frankish leader. Do you think he was short? Maybe he was! He became the king of the Franks in the year 751 CE. In 754 Pope Stephen II officially crowned Pepin and then anointed both Charlemagne and his younger brother Carloman.
When Pepin died he left his empire to his two sons. Not sure this was such a good idea as they used to fight a lot! But eventually his younger brother Carloman died, and the empire was left to Charlemagne!