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It was for the most part rebuilt under Gregory IV. in 838.

Marianus Sectus, the Chronicle writer of the twelfth.century, cited by Baronius, makes no mention in it of Gregory IV. and confines himself to saying, that in the year 835, Pepin and Louis restored to their father the sovereign power.

We also see Gregory IV. in 827, solicit the emperor to confirm his election;75 which proves, as we have already observed, that Louis had not renounced this right in 819.

In defiance of this preliminary, the pontificate of Gregory IV. is, nevertheless, one of the most memorable for the humiliations of the imperial dignity.

After the circumstances which had so humbled the imperial power, we are not astonished to see Sergius II. succeed Gregory IV. without waiting for the Emperor Lothaire’s consent.