Geography/Culture: Ancient Italian, Roman. She has a spring at Porta Capena, near Rome and the grove at Aricia.
Linguistic Note: possibly from Greek aigeiros, 'the poplar', derivation uncertain. Latin aegeiria, 'black-poplar'.
Description: Goddess of wisdom, prophecy, healing-springs and death; Oak Queen; Giver of urban laws; Teacher of rites for the worship of Earth; Granter of easy delivery.
To Whom Sacred: oak; mistletoe (a branch of which, if broken off Her oak by a run-away slave was a fight-to-the-death challenge to current priest who had attained his position in the same way); [black-poplar]; spring (at the Porta Capena); mid-summer and mid-winter marriage festivals.
Festival: May 01 -- when the Romans would go in procession to Her grotto. At Midsummer, during the Alban Holiday, Her marriage feast with the Oak-King was celebrated -- an occasion of promiscuous love-making, repeated at Mid-winter during the Saturnalia.
Male Associates: Male counter-part at Aricia: Manius-Egerius, perhaps an alternate name for Her consort: Virbius, Holy-Life, (or Twice-a-Man). She gave inspiration and advice to lover: Numa.

Titles/Variants, etc:
• Variant: Aegeiria, She-of-the-Poplar, below.
• A Carmenae, Revealers-of-Wisdom, (They are linked with Carmenta, Revealer-of-Wisdom), Egeria's spring is said to be in the grove of the Carmenae.
• This the name of the 4th Carmenta, Revealer-of-Wisdom.
• Perhaps an aspect of Diana-Nemorensis, Diana-of-Nemi, (below), with Whom She shares the grove at Aricia.
• She may have assimilated Etruscan Vegoia, ----, below.

Geography/Culture: Greek.
Linguistic Note: c(psilon)iro(mikron)s, 'the poplar'.

Titles/Variants, etc:
• ù Transcription variant: Aegeiria.
• Greek form of Roman: Egeria, She-of-the-Black-Poplar, above.

Geography/Culture: Roman.
Description: Eponym of the grove at Aricia.

Titles/Variants, etc:
• {I wonder if this name is the origin of Aradia, , Who is linked with Diana, }.
• Alternate name for Diana-Nemorensis, Queen-of-the-Grove.
• Since the grove is shared by Diana-Nemorensis, Queen-of-the-Grove and Egeria, She-of-the-Black-Poplar, I'm going to assume Aricia, ----, is an alternate name for Egeria.
• Perhaps Nemorensis, Queen-of-the-Grove, is related to Romano-British Nementona, , Who is linked with Sulis, She-Who-Brings-Forth.

Geography/Culture: Roman. Near Lake Nemi.
Description: Goddess of the grove.
To Whom Sacred: oak; mistletoe.
Male Associate: consort, Virbius (Dianus).

Titles/Variants, etc:
• Title of Diana, Divine-Queen, from Her shrine near lake Nemi.

Geography/Culture: Etruscan.
Description: Goddess of civilization; Teacher of rituals and augury; Inventor of measurement and the setting of boundaries; culture Bringer.

Titles/Variants, etc:
• Spelling or language variant: Begoe.