The name Hadeland appears on the Dynna stone, a runestone from about 1040-1050. Norway formally adopted Christianity in 1030, and the Dynna stone, with its scenes from the Nativity is one of the first Christian monuments in Norway. A number of medieval churches survive in Hadeland. Notable among them is the Tingelstad old church. This was built in the 13th century. Other churches include Lunner church and the Sister Churches at Granavollen. The Black Death arrived in Norway in the mid 14th century, and it is estimated that two-thirds of the population of Hadeland was wiped out.