He brought into his episcopal city the relics of so many martyrs that it received the Greek moniker Martyropolis.

[2] In the interests of the Church of Persia, which had suffered much in the persecution of Shapur II, he came to Constantinople, but found Emperor Arcadius too busily engaged in the affairs about the exile of St. John Chrysostom.

Later Maruthas was sent by Emperor Theodosius II to the court of Persia, where, notwithstanding the Magi, he won the esteem of King Yazdegerd I of Persia by his affability, saintly life,[4] and, as is claimed, by his knowledge of medicine.

[5] A great organizer, he was one of the first to give a regular structure to the church, helped in his mission by the catholicos Isaac.

His writings include: He also wrote hymns on the Holy Eucharist, on the Cross, and on saints killed in Shapur's persecution.