Hey everyone, Peace of Christ to all.
Does anyone know why St. Demiana is not known among the Western Christians or among E.O??
Was she canonized later after the schism? She did suffer under Diocletian. Thanks.
Generally, early martyrs aren't canonized, they're simply added to the list. And there's no authoritative complete list of Eastern Orthodox (or even Roman Catholic saints) that I know of. Oftentimes, even ancient saints have only a local veneration. That's not at all to say others don't recognize them as saints, but sanctoral calendars are by and large local things. (Then there are those saints who fall out of public veneration, being forgotten or superseded by others.)
Wikipedia says Empress St. Helen built a church over her tomb. I couldn't find anything else in a cursory search. But if she comes to the attention of those who make calendars of saints--ones which have a lot--she may be added.