theodosian

from The Century Dictionary.

• Pertaining to any one named Theodosius, particularly to either of the emperors Theodosius I. (379–395) and Theodosius II. (408–450).
• noun One of a body of Russian dissenters who purify by prayer all articles purchased from unbelievers: so called from their founder, Theodosius, a Russian monk in the sixteenth century.