The Viking Age started in 793, when the Norsemen from Scandinavia made their first signifcant attack on the rest of Europe.
Their first attack was on the famous monastery of Lindisfarne – one of the most important centres of early English Christianity. Irish monks had settled here in AD 635 and the monastery became a great center for learning. The masterpiece now known as the Lindisfarne Gospels was created here in the early 8th century (gorgeous Celtic images!).
The ruins in the image are in Lindisfarne, but belong to a now a 12th-century priory, which claimed direct descent from the early monastery.
The quote is by the scholar Alcuin of York, he had also worked in the famous Aachen school of Charlemagne.
"The Great World History Book"