Pope leo iii made charlemagne emperor of the romans because charlemagne had crushed a rebellion in rome.
a. true
b. false

Pope leo iii made charlemagne emperor of the romans because charlemagne had crushed a rebellion in rome is true statement other reasons are well explaiend y historian john bryce 

"when  odoacer   compelled the abdication of  romulus augustulus , he did not abolish the western empire as a separate power, but cause it to be reunited with or sink into the eastern, so that from that time there was a single undivided roman empire  [pope leo iii and charlemagne], like their predecessors, held the roman empire to be one and indivisible, and proposed by the coronation of [charlemagne] not to proclaim a severance of the east and west  they were not revolting against a reigning sovereign, but legitimately filling up the place of the deposed  constantine vi   [charlemagne] was held to be the legitimate successor, not of romulus augustulus, but of constantine vi  "