Science Squabbling

I think you'll find they're Pegasii.

I'm not sure anyone, in the whole history of the internet, has used the Latinate plural of Pegasus before.

Well done.

Unfortunately, Pegasus was actually an individual, and there is therefore no plural of his name. Not only that, but had there been a plural form, it would most likely have been either the Greek Πήγασοι or the Latin Pegasi or Pegasūs (no idea whether Pegasus fell into the second or the u-declension). :)

https://en.wikipedia.org/wiki/Pegasus