Hieromonk Matthew (Blastares) was a noted canonist and hymnographer of the fourteenth century who had authored numerous works. He was attached to the monastery of the Theotokos Peribleptos in Thessalonica. His writings include theological treatises on the question of union with Rome, the hesychast controversy, and translations of earlier Greek fathers.
His most famous work was the Alphabetical Collection, an encyclopedia of canon law published in 1335.
- Rev. Dr. Patrick Viscuso, "A Late Byzantine Theology of Canon Law," The Greek Orthodox Theological Review 34 (1989): 203-219.