Clovis is 3rd, and he's older. Euphemia is also 3rd princess, Cornelia is 2. Schneizel is 2nd, too. We don't know the rest. But assuming there's a balance among the number of princes and princesses and everyone has equal right to the throne based on age, Lelouch would be....the 9th prince or something. Which is funny, since he played chess with Clovis as a kid. XD
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