3562

In 3562, the Earth Alliance defeated the Knights of Velyshaa, banishing them to isolation on their homeworld. (AUDIO: The Sirens of Time)

Alternative timeline
In an alternative timeline accidentally created by the Fifth Doctor, the RMS Lusitania did not sink on 7 May 1915 and a petty criminal named Eric Charles Vincent (who died in the sinking of the Lusitania in the proper timeline) killed Alexander Fleming in December in a botched robbery attempt before the biologist discovered penicillin. Without the protection offered by penicillin, Earth fell prey to new strains of meningitis and pneumonia in 1956 and the survivors never developed a space programme. Consequently, the Knights of Velyshaa were not defeated by the Earth Alliance in 3562. (AUDIO: The Sirens of Time)