IO, changed to a heifer by Jupiter

IOBATES, King of Lycia

IOLAUS, servant of Hercules

IOLE, sister of Dryope

IONA, or Icolmkill, a small northern island near Scotland, where
St Columba founded a missionary monastery (563 AD)

IONIA, coast of Asia Minor

IPHIGENIA, daughter of Agamemnon, offered as a sacrifice but carried away by Diana

IPHIS, died for love of Anaxarete, 78

IPHITAS, friend of Hercules, killed by him

IRIS, goddess of the rainbow, messenger of Juno and Zeus