Identity and Sources
The anchor record for this saint is a stub: the OCA calendar confirms a New Martyr Demetrius on May 28 but offers no life, and the database entry leaves region and era blank. Identification with Demetrius (Mitros) of Tripolitsa rests on the Greek liturgical calendar and a Greek hagiographical account, which together fix his place at Tripolis in the Peloponnese and the year of his death at 1794.
A separate tradition, recorded under the name Demetrios the Neomartyr, describes a Demetrios of the same region who became a monk on Chios and is commemorated on April 14; whether this represents a variant of the same life or a distinct neomartyr of the same name is not settled by the available sources. This account is therefore noted but not relied upon for the May 28 commemoration.