Ryahovo (Bulgarian: Ряхово) is a village in northern Bulgaria, and as Ancient Ap(p)iaria a former bishopric, remaining a Latin Catholic titular see.

[2] Apiaria Bight on Brabant Island in the Palmer Archipelago, Antarctica, was named after the village.

[3] Appiaria was important enough in the Roman province of Moesia Inferior (=Secunda) to become a suffragan diocese of the capital's Metropolitan Archdiocese of Marcianopolis, in the sway of the Patriarchate of Constantinople.

It has two documented incumbents : The see isn't mentioned in the Notitia Episcopatuum by pseudo-Epifanius, edited under Emperor Heraclius I (circa 640), probably having ceased after the ruinous Bulgarian invasion.

It has had the following incumbents, so far of the fitting Episcopal (lowest) rank, including an Eastern Catholic: This Ruse Province, Bulgaria location article is a stub.