Patronymics are generally Greek-derived Latin nouns with special endings, appearing frequently in epic poetry and rarely elsewhere. They may be masculine or feminine, but always one or the other, depending on the specific ending:
- -adēs, idēs, īdēs and -eus are masculine
- –ās, is, and -ēis are feminine
In Greek, these are usually adjectives; in Latin, they are usually nouns.
Exempla:
- Tydareus, -ī (the Spartan king) —> Tyndaridēs, -ae (either Castor or Pollux, the twin sons of Tyndareus)
- Tydareus, -ī (the Spartan king) —> Tyndaris, -idis (Helen, the daughter of Tyndareus)
- Anchīsēs, -ae (Anchises, the Dardanian prince) —> Anchīsiadēs, -ae (Aeneas, the son of Anchises)
- Tydeus, -ī, (Tydeus, the Aeolian hero) —> Tydīdēs, -ae (Domedes, the son of Tydeus)
- Oīleus, -ī (Oileus, the Locrian king) —> Aiāx Oīleus, Aiācis Oīleī (Ajax Minor, the son of Oileus)
- Hesperus, -ī (the Evening Star) —> Hesperis, -idis sg. (a daughter of Hesperus) —> Hesperides, -um pl. the Hesperides (not Hesperidēs, -ae, which would be masculine)
The Essential AG: 244