How Did Charlemagne Establish The Holy Roman Empire

Charlemagne known as “karl and Charles the Great”. He was born in the dark ages in 742, his birth place is unknown but suggested that he was born in present day germany. He grew up with three siblings with the parents of pepin “the short” and bertrada. Sadly in 768 his father died and after his father's death, charlemagne shared the kingdom with his brother carloman but in 771 carloman died and Charlemagne took control of the whole frankish realm. In 800 on christmas day, Pope leo iii crowned charlemagne the holy roman empire. After years of leading and military wins in 806 at the age of sixty four charlemagne divided his kingdom among his three sons. Then two of charlemagne's sons died so in 813 he crowned his son luis but later called “the pious”.Later in 814 Charlemagne died of ill- heath and of old age, he died at 72. How was charlemagne able to gain and establish the holy roman empire?
Charlemagne didn’t consider himself as “emperor” but liked to be called king of the franks and lombards. In 772, Charlemagne defeated the saxons after thirty years of war. He spend most of his time as king focused on battles and that’s probably why he fought in more than fifty battles. Charlemagne’s winnings made him capable of making and sustaining control over his empire. Three decades of charlemagne’s reign were dominated by military