On 5 November 1922 a stained-glass window was unveiled at Church of the Holy Trinity by Bishop of Toronto James Fielding Sweeny, dedicated to the memory of Lieutenant Gavin Ince Langmuir, who was killed in the First World War. The upper panes of the window depict St. Michael coming to Joan of Arc with a laurel wreath of victory. The lower panes are dedicated to his parents and depict Jesus is depicted preaching to Langmuir's father. Above the window panels is the family crest of a cap and greyhound. The window was designed and constructed by N.T. Lyon Co.
Langmuir was born on 10 October 1892 in Toronto, Ontario to Archibald David and Margaret Langmuir. He worked as an appraiser and was a member of the 48th Highlanders militia; on 20 September 1914, he was commissioned to be a lieutenant in the 15th Battalion. On the first day of Second Ypres, 22 April 1915, he was reported missing, later presumed to have been killed in action.
