1950 removal of the Stone of Scone
On 25 December 1950, four Scottish students from the University of Glasgow (Ian Hamilton, Gavin Vernon, Kay Matheson and Alan Stuart) removed the Stone of Scone from Westminster Abbey in London and took it back to Scotland. The students were members of the Scottish Covenant Association, a group that supported home rule for Scotland.
Source: Wikipedia — 1950 removal of the Stone of Scone (CC BY-SA 4.0)