Viking coins from 1,000 years ago, some of which were produced in Dublin, have been officially declared as treasure in Britain.

The hoard, which dates back to the 10th and 11th Centuries, was found in Llandwrog, north Wales, by a local man using a metal detector earlier this year.

Experts believe the hoard was deliberately buried in the ground between 1020 and 1030 in a bid to store the silver.

The historic items were uncovered by Caernarfon treasure hunter Walter Hanks in March.

But while many may think the rule of "finders keepers" may apply the law states that anyone finding treasure must report it to their local coroner within 14 days or face prosecution.

Now the items have been declared as treasure by North West Wales coroner Dewi Pritchard-Jones, the process of finding out how much they are worth can begin.

National Museum Wales said it would be interested in buying the coins if it could secure lottery funding.

A spokeswoman added: "Now that the hoard has been declared treasure by the coroner, the next step will be to courier this to The British Museum for temporary safe keeping.

"The independent Treasure Valuation Committee, will commission an expert valuer to offer their view on current market/collector value and the committee will consider this, before making their recommendation.

"Finders and landowners are consulted and are able to offer comment or commission their own valuations, if they wish.

"Usually what happens is that the value is split equally between the finder and the landowner with each getting 50% of the current market value."

Officials say the coins have been identified as fourteen silver pennies produced at Dublin under the Hiberno-Scandinavian ruler Sihtric Anlafsson (989-1036).

Sihtric was King of Dublin when viking forces led by Sigurd of Orkney and Brodir of Mann were defeated by Brian Boru in the Battle of Clontarf in 1014.

Eight coins are dated from circa 995, while six coins are from 1018.

Dr Mark Redknap, head of collections at the National Museum of Wales, added: "It amplifies the picture we are building up of the wealth and economy operating in the kingdom of Gwynedd in the 11th Century."