St Magnus-the-Martyr Great Plague of 1665, the City authorities ordered fires to be kept burning night and day, in the hope that the air would be cleansed. Daniel Defoe's semi-fictictional, but highly realistic, work "A Journal of the Plague Year" records that one of these was "just by St Magnus Church". Despite its escape in 1633, the church was one of the first buildings to be destroyed in the Great Fire of London in 1666. St Magnus stood less than 300 yards from the bakehouse of Thomas Farriner in Pudding Lane where the fire started. Farriner, a former churchwarden of St Magnus,
Great Fire of London to inspect the scene. He found that houses were still not being pulled down, in spite of Bloodworth's assurances to Pepys, and daringly overrode the authority of Bloodworth to order wholesale demolitions west of the fire zone. The delay rendered these measures largely futile, as the fire was already out of control. By Sunday afternoon, 18 hours after the alarm was raised in Pudding Lane, the fire had become a raging firestorm that created its own weather. A tremendous uprush of hot air above the flames was driven by the chimney effect wherever constrictions narrowed the air current, such as