[4] He had the atrium of Old St. Peter's Basilica paved with large blocks of white marble, and restored other churches of Rome, notably the church of St. Euphemia on the Appian Way and the Basilica of St. Paul Outside the Walls.
[5] Donus was shocked to discover a colony of Nestorian monks in Boetianum, a Syrian monastery in Rome.
He gave their monastery to Roman monks and dispersed them through the various religious houses of the city in the hope that they would accept Chalcedonian Christianity.
On 10 August 678, Emperor Constantine IV addressed him as "the most holy and blessed archbishop of our ancient Rome and the universal pope," hoping to attract him to engage in negotiations with the patriarch of Constantinople and the Monothelites.
[8] He ordered that Pope Vitalianus' name be put back in the diptychs of those bishops in communion with Constantinople, an act which caused him a great deal of trouble from the Monothelites and Patriarch Theodore I of Constantinople.