Harry Potter star Jason Isaacs has unveiled a tribute to the war poet Wilfred Owen at the former hospital where he was treated for shell shock.
The flagstone was donated to the university by Glen-Art, a military charity supporting former members of the armed forces.
It lies outside the old main entrance to the building as a permanent memorial to Owen and all those affected by the First World War and other conflicts.
Fiona MacDonald, founder and director of Glen-Art and a trustee of the Wilfred Owen Association, said: "We are delighted to be able to donate this beautiful stone as the first of many events and activities commemorating the centenary of the time Wilfred Owen spent at Craiglockhart, where he met Siegfried Sassoon."