A collection of material relating to Kevin Barry, who was executed for his part in the killing of three British soldiers in 1920. The collection includes material associated with his days at Belvedere College, his year as a medical student in UCD, and his brief time in custody at Mountjoy Prison before execution. The majority of the collection is composed of material gathered by Kathy Barry Maloney, Barry's sister, after his death.

This collection consists largely of letters from Roger Casement to Captain Hans Boehm, during Casement's stay in Germany in 1915, as well as some associated material (photographs, medals) relating to his first contact with the German authorities in November and December 1914 and the formation of the Irish Brigade in 1915.