Cheap flights from Pennsylvania to Sofia
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One interesting thing about Serdica during the late Roman occupation is the fact that Christianity was more easily accepted here, leading to Serdica hosting an Ecumenical Council in 343 AD. When the Western Roman Empire lost its power, Serdica became a part of the Byzantium, and reached its peak under the reign of Justinian I. In the 6th century, the cathedral St. Sofia was erected.... (read more in our Sofia History)
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