The Princess Patricia's Canadian Light Infantry First World War Plaques were first unveiled in 1926 in the chapel of the convent of the Sisters Adorers of the Precious Blood, located on Echo Drive across the Rideau Canal opposite Lansdowne Park. Catholic soldiers of the Princess Patricia's Canadian Light Infantry worshiped in the chapel during August 1914 while quartered in Lansdowne Park. Later, a congregation without a church building used the chapel and when the convent closed in 1984 the plaques were moved with the congregation.
The plaques were likely the idea of Lady Buller, mother of Lieutenant-Colonel Herbert Buller, the first Adjutant and the second Commanding Officer of the Regiment. In the inscription, she included the Founder, Colonel Hamilton Gault; a former Commanding Officer, Colonel Agar Adamson; and the widows of four members of the Regiment. The three brass plaques are mounted on wooden frames. Two of the plaques are similar shields, one in English and one in French.
In 1993, the congregation settled in St. Clement’s Church on Mann Avenue in Sandy Hill. In 2011, the parish was reorganized and St. Clement’s Church was closed. The congregation moved to Saint Anne Catholic Church on Old St. Patrick Avenue and the plaques again moved with them, but were placed in storage in the church's cupboard. In 2012, during initial preparations for the 100th Anniversary of the Princess Patricia's Canadian Light Infantry, the Ottawa Association Branch began searching for the plaques which were eventually found in storage at Saint Anne Church. The Princess Patricia's Canadian Light Infantry Association arranged and paid for the professional restoration of the three plaques.
On 19 September 2014, the Colonel-in-Chief, the Right Honorable Adrienne Clarkson unveiled the new rededication plaque alongside the originals which are mounted on the walls in the main entrance of the church.
