Kavass is a Turkish name for an armed police-officer, also for a courier such as it is usual to engage when travelling in Turkey.
The name is used, inter alia, for the guards that traditionally preserve public order at the important worship spots of the Holy Land (formerly under Ottoman Turkey jurisdiction), such as the Holy Sepulcher in Jerusalem and the Nativity Church in Bethlehem.
This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "article name needed". Encyclopædia Britannica (11th ed.). Cambridge University Press.
References
Kavass Wikipedia(Text) CC BY-SA