 In April 1866, there was an attempt on the emperor's life in St. Petersburg by Dmitry Karakozov.To commemorate his narrow escape from death (which he himself referred to only as "the event of 4 April 1866"), a number of churches and chapels were built in many Russian cities.Viktor Hartmann, a Russian architect, even sketched a design of a monumental gate (which was never built) to commemorate the event.