“Crossing the Rubicon” is now an expression for passing the point of no return: this is the original incident from which it derives. In 49 BCE, Gaius Julius, at that time just a general and not yet Caesar, led his army across the Rubicon river, which marked the border of Rome: to cross it marked him as a treasonous leader of a revolt against the Roman state. Famously, he is said to have quoted the Greek playwright Menander, saying “alea iacta est” – “the die is cast.”
Julius would be successful in his quest for the leadership of Rome and its empire (much of which, particularly Gaul, added by his own military genius): which is why history knows him best as Julius Caesar.
The Abbey at Lindisfarne Island in Northumbria was founded in 635 CE by St Aidan. In the years that followed, it produced one of the most famous illuminated manuscripts, the Lindisfarne Gospels, and became the final resting place of St Cuthbert, who had been Abbot and later Bishop of Lindisfarne. It was a peaceful place of contemplation and worship.
All that changed on June 6, 793 CE. On that day, the Abbey was raided and destroyed by Viking raiders. It was the first major assault on the British Isles by Vikings, but many more would follow over the next few centuries, culminating in England’s invasion and takeover by the Viking-descended Normans in 1066. Some of the monks escaped with the body of St Cuthbert and the Lindisfarne Gospels manuscript, but the abbey itself was destroyed and not rebuilt until after the Norman Conquest.