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A few Sparta-themed YTMNDs had already been created, but Keaton uploaded his remix to YTMND on February 19th, 2007. This single instance has over 151,000 views, which is quite high for a YTMND.
Almost immediately, Keaton’s Sparta Mix began appearing in Youtube videos.
For information on the larger “This is Sparta” meme, see the meme entry.