Placidia Palace
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The Placidia Palace was the official residence of the papal apocrisiarius, the ambassador from the pope to the patriarch of Constantinople, and the intermittent home of the pope himself when in residence at Constantinople.[1][2] The apocrisiarius held "considerable influence as a conduit for both public and covert communications" between pope and Byzantine emperor.[3]
The residence of the apocrisiarius in the Placidia Palace dates to the end of the Acacian schism in 519.[3] The ambassador was usually a deacon of Rome, and held an official position in the Byzantine imperial court.[3] Anachronistically, the building can be referred to as the first nunciature.[4]