The researchers in Ireland looked at their computer screen, marvelling at a medieval book tracked down in a Roman library. They flipped through its digitised pages and found their sought-after treasure: the oldest surviving English poem.

"We were extremely surprised. We were speechless. We couldn't believe our eyes when we first saw that," Elisabetta Magnanti, a visiting research fellow at Trinity College Dublin's school of English, told The Associated Press.

What's more, she said, the poem was within the main body of Latin text: "It was extraordinary."