Kefalonia or Cephalonia (Greek: Κεφαλονιά), formerly also known as Kefallinia or Kephallenia (Κεφαλληνία), is the largest of the Ionian Islands in western Greece and the 6th-largest island in Greece after Crete, Euboea, Lesbos, Rhodes and Chios. It is also a separate regional unit of the Ionian Islands region. It was a former Latin Catholic diocese Kefalonia–Zakynthos (Cefalonia–Zante) and short-lived titular see as just Kefalonia. The largest cities of Cephalonia are Argostoli and Lixouri.
The province of Epirus (Latin: Provincia Epiri, Koine and Medieval Greek: Ἐπαρχία Ἠπείρου, Eparchía Ēpeírou) was a province of the Roman Empire, covering the region of Ancient Epirus. Rome first annexed the region in 167 BC, in the aftermath of the Third Macedonian War, and initially put the region in the larger Roman province of Macedonia, which at the time covered the whole of the Hellenistic world in mainland Europe. In 27 BC, Epirus and Achaea were separated from Macedonia and grouped into the senatorial province of Achaea, with the exception of its northernmost part, which remained part of the province of Macedonia. Under Emperor Trajan, sometime between 103 and 114 AD, Epirus became a separate province, under a procurator Augusti. The new province extended from the Gulf of Aulon (Vlorë) and the Acroceraunian Mountains in the north to the lower course of the Acheloos River in the south, and included the northern Ionian Islands of Corfu, Lefkada, Ithaca, Cephallonia, and Zakynthos.