Protos
Protos is a Civil Administrator of Mount Athos or pipe organ.
Overview
Ecclesiastical and political-administrative office.
In detail
It is associated with Byzantine Empire and Ottoman Empire.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“Protos (monastic office)”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q7252112: Protos
Consult the source