#OTD in 1870.
Libraries of the University of Strasbourg and the City of Strasbourg at Temple Neuf are destroyed by fire during the Siege of Strasbourg in the Franco-Prussian War, resulting in the loss of 3,446 medieval manuscripts, including the original 12th-century Hortus deliciarum compiled by Herrad of Landsberg, the Apologist codex containing the only text of the early Epistle to Diognetus, and rare Renaissance books.