It was discovered in 2007 by a father-son team using metal detectors in an unplowed field. They brought the find intact to the British Museum. An archaeological dig in the spot shortly after revealed no sign of a settlement, suggesting that the person who hid it went far afield to keep it away from others.
The silver bowl had been lined with gold, and filled with 617 silver coins and 65 other artifacts, including hacksilver and a gold arm ring. The whole had been enclosed in sheets of lead to preserve it. The coins were not all of the same minting: there were coins with Christian, Islamic, and Norse pagan symbols. Dating the coins to the late 9th and early 10th century gave a date after which the hoard could not have been assembled.
The variety of sources for the coins was not the only surprise. The owner was widely traveled, or was the recipient of widely traveled goods. The silver vessel seems to have come from a Carolingian artist, and one coin is a dirham, from Samarkand (present-day Uzbekistan).
How did research lead to such a specific date for burial as 927? In that year, Æthelstan captured York from the Vikings, the final stage of his campaign to recapture Britain from the Vikings. In July of that year he met with the kings of Scotland and Wales to receive their acknowledgement of his authority. He struck silver coins commemorating himself as EDELSTAN REX TO BRIE ("Æthelstan, King of all Britons"). One of these coins in mint condition exists in the hoard, suggesting that it was one of the last additions to the collection and the hoard would have been hidden shortly after.
The Vale of York Hoard (also called the Harrogate Hoard and the Vale of York Viking Hoard) gives a glimpse into the economic breadth of early 10th century Britain. Labeled officially as a "treasure," it had to be offered to museums (instead of kept by the finder or given to descendants of the original owners). Valued at a little over 1.4 million dollars, it was purchased jointly by the British Museum and the York Museums Trust. It is displayed now in the Yorkshire Museum.
Now, let's look at another "largest" hoard, the Staffordshire Hoard.
