Euthymius the Younger was born with the baptismal name Niketas in Opso, Galatia either in 823 or 824.
[2] He also established a double monastery at Peristerai on Mount Chortiatis near Thessalonica.
While living in solitude, he died on the island of Hiera on 14 or 15 October 898.
[2] His disciple Basil wrote a hagiography or vita (MS BHG 655) of Euthymius.
The vita was written in high-register Byzantine Greek and cites writers such as Gregory of Nazianzos, Cyril of Alexandria, John of the Ladder, Theodore of Stoudios, and pseudo-Eustathios of Thessalonica.