Dawyck Haig, the second Earl Haig, was a modern artist and the son of Field Marshall Douglas Haig, the commander who sent men over the top at Passchedaele and the Somme. He was imprisoned at Colditz during WWII as a member of the "prominenti" (famous PoWs)  but escaped in 1945  with a German officer's help.  He kept that officer's knife at his home, Bemersyde House, for the rest of his life. I know this because I interviewed Haig for the Sunday Times. It was like meeting living history. He was involved in many of the most intense events of the twentieth century.  He died, aged 91,  last week. This excellent obituary appears in the Guardian. This piece adds colour.    

Obuituary of Earl Haig