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Charles the Martell could successfully defeat the Arab Empire at Tours, thereby stopping the spread of the Islam in Europe as well.
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Pepin the short helped the pope to fight against the Lombards, which was successful, and this event caused and helped the birth and the beginning of the Papal State.
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Charles the Great was coronized as an emperor in Aachen.
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Charlemagne died in 814, so his only son, Louis the Pious became the new ruler, but he was not really fit for the job. He was too religious to deal with ruling an empire.
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After the death of Louis the Pious, the empire was divided into 3 parts, each son of his got one territory.