Gresli in Tydal, Sør-Trøndelag 

In 1878, 2253 coins were found on the Gresli farm during potato hilling on a spot where there had once been a heap of rocks. 

The Gresli hoard is our most important source of knowledge about Olav Kyrre's extensive minting in Norway in the years 1067-1093. In 1881, a meticulous record of the hoard was published by L. B. Stenersen, the director of the Coin Cabinet. It has since been studied by a series of scholars. 

Dating: after ca. 1080 

Above: a penny from Olav Kyrre 
Here you can see a complete overview  complete overview of the find. 
 Pennies from Olav Kyrre