weren't the york slings viking slings ?
Never been to the jorvik viking centre in york, but it's pretty famous.
And there have been a lot of viking artifacts excavated in york.

I think I've been to york twice, many years ago, just never made it to the viking centre.

Yes -- Jorvik is the Danish "viking" name for the city, which mutated into "York" in Anglo-Saxon.  The city was founded by the Romans as Eboracum, and then revived as an Anglo-Saxon trading port called Eoforwic, captured by the Danes in 866,  Of course there were Britons, Anglo-Saxons, Danes, and others living there from the 700s right up to 955 when Eric Bloodaxe, the last Danish "King of Jorvik" died and Northumbria became a major Earldom of England.

There were probably slingers in that area from pre-Roman times right up to the Norman Conquest.