The Great Fire helped end the Great Plague in London.

Evidence

Yet the fire extinguished the plague, and to later times it seems that the real calamity was not so much the destruction of the insanitary medieval city as the failure to carry through Wren’s plan for rebuilding it as a unity of quays and avenues centred on St Paul’s and the Royal Exchange. — Winston Churchill, A History of the English-Speaking…, 1187

Categorization

• corroborated: 2 independent passages support this claim — Winston Churchill, A History of the English-Speaking…, 1187