Fortunately, when the alien warlord was told we have two leaders, Cameron and Clegg he decided we were a schizophrenic planet full of boggin' weirdoes and decided to leg it back to Alpha wherever it was rather than ruisk being contaminated by Terran madness.
If he was a historian he may have confused us with the Spartans, who were ruled by a duumvirate, but I rather doubt it.