The National Lottery has given Orkney Archaeological Society £10,000 to enable its members to study the graffiti scrawled on an island cathedral.
The graffiti includes writing such as mason marks, detailing the involvement of skills craftspeople in the construction of St Magnus Cathedral in Kirkwall.
Trained volunteers will record the graffiti inside and outside of the place of worship.
A spokesperson for the society said: “Our trained volunteers will be working in the cathedral, recording, photographing and writing up all marks, graffiti and other carvings that have been made in the building over the hundreds of years.
“We will have full access to the building, including behind the scenes and to places where the public are usually not allowed.
“At the end of the project we will be publishing a pamphlet and all volunteers will be able to go on and do similar tasks in other buildings as needed.”
The society thanked the Heritage Lottery Fund for the money supporting the project “at the wonderful, beautiful and hugely historic St Magnus Cathedral”.