The Church of Panagia Parigoritissa (Ναός της Παναγίας της Παρηγορήτισσας) is the most important Byzantine-era church in Arta. It was built around 1290 by the despot of Epirus Nikephoros I Komnenos Doukas (1271-1296), his wife, and their son. It served as the katholikon of a monastery. It is a two story structure with a central dome and four smaller domes. A mosaic of Christ Pantokrator is in the central dome.
Map of Byzantine Arta
Byzantine Architecture by Cyril Mango
Early Christian and Byzantine Architecture by Richard Krautheimer
Oxford Dictionary of Byzantium edited by Alexander Kazhdan