1 The nom./dat./abl. plural forms regularly developed into a monosyllable /iː(s)/, with later remodelling - compare the etymology of deus.This /iː/ was normally spelled as EI during and as II after the Republic; a disyllabic iī, spelled II, Iꟾ, appears in Silver Age poetry, while disyllabic eīs is only post-Classical. Other spellings include EEI(S), EIEI(S), IEI(S). More @Wikipedia
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