The Puranic pantheon (Vishnu, Shiva, Devi at the centre) emerged only after centuries of Vedic worship. The Rig Veda\'s most-hymned deity is Indra (~250 hymns), then Agni (~200). Vishnu has ~5 hymns; Shiva (as Rudra) ~3. To read a Vedic mantra without recognising Indra, Agni, Varuna, Ushas is to miss the cosmology. 10 primary deities catalogued below — each with their Vedic function, iconography, signature mantra, and what became of them in the Puranic period.
Indra · इन्द्र
Rig Veda hymns: ~250 hymns (the most-hymned deity in the Rig Veda)
Domain: King of the devas. God of thunder, rain, war, soma.
Function
Slayer of Vritra (the cosmic serpent that withheld the waters). Releasing the rivers by killing Vritra established the cosmic order — the central myth of the Rig Veda.
Iconography
Bears the vajra (thunderbolt forged by Tvashta from sage Dadhichi's bones). Mounted on Airavata (the white four-tusked elephant). Drinks soma.
Signature mantra · Rig Veda 1.32.1
इन्द्रस्य नु वीर्याणि प्र वोचं यानि चकार प्रथमानि वज्री।
अहन्नहिमन्वपस्ततर्द प्र वक्षणा अभिनत्पर्वतानाम्॥
I shall now declare the heroic deeds of Indra — those first feats that the thunder-wielder performed. He slew the dragon (Vritra), released the waters, and cleft open the bellies of the mountains.
Later development — In the Puranic period, Indra became a "lord of the devas" who could be defeated by demons and required Vishnu / Shiva to rescue him. The Bhagavata stories repeatedly show Indra's pride being broken (Govardhana hill incident with Krishna, etc).
Agni · अग्नि
Rig Veda hymns: ~200 hymns (second-most). The opening hymn of the Rig Veda is to Agni.
Domain: God of fire. Messenger between humans and devas — every yajna offering travels through Agni.
Function
Hota (priest) of the yajna. Without Agni accepting the offering, no havis (oblation) reaches the deva for whom it was intended. Agni is the mouth of the devas.
Iconography
Twin-headed, seven-tongued, seven-handed, three-legged. Mounted on a ram. Holds ladle + fire-stick + ghee-pot.
Signature mantra · Rig Veda 1.1.1 (the very first mantra of the entire Rig Veda)
अग्निमीळे पुरोहितं यज्ञस्य देवमृत्विजम्।
होतारं रत्नधातमम्॥
I praise Agni — the purohita (placed in front), the divine ritvij of the yajna, the hota, the best granter of jewels.
Later development — Remains central to all Hindu fire-rituals — marriage saptapadi, antyeshti, every homa. In the Puranic period sometimes treated as a minor lokapala (south-east direction).
Varuna · वरुण
Rig Veda hymns: ~50 hymns
Domain: Sovereign of cosmic order (Rita), the night sky, the cosmic waters, and moral law.
Function
Asura-king who upholds Rita (cosmic order). Punisher of sin — the dropsy disease was attributed to Varuna's anger. Releases sinners when they pray. Lord of oaths.
Iconography
Holds a noose (pasha) to bind sinners. Mounted on Makara (sea-creature). Robed in golden mail.
Signature mantra · Rig Veda 7.86.1
धीरा त्वस्य महिना जनूंषि वि यस्तस्तम्भ रोदसी चिदुर्वी।
प्र नाकमृष्वं नुनुदे बृहन्तं द्विता नक्षत्रं पप्रथच्च भूम॥
Wise indeed are the generations of this Varuna — who has propped apart the two wide worlds (earth + sky), pushed up the lofty firmament, set forth the stars and the broad earth (twice over).
Later development — Largely demoted to a lokapala (guardian of the western direction). His former cosmic-ruler functions transferred to Vishnu / Brahma. Survives mainly in formal sankalpas and in the daily Sandhya prashana mantra.
Surya · सूर्य
Rig Veda hymns: ~10 hymns directly; pervades many others.
Domain: The sun. Source of life, all light, time. The visible Brahman.
Function
Crosses the sky daily in a chariot of seven horses (the seven colours). At sunset enters the cosmic waters and returns at dawn. The Gayatri mantra is to Savitri = Surya in his aspect as impeller.
Iconography
Two-armed, holding two lotuses. Mounted on a chariot driven by Aruna (the dawn). Seven horses (representing the seven chakras / metres).
Signature mantra · Rig Veda 1.50.10 (closing verse of Surya-suktam) — combined with Gayatri
उद्वयं तमसस्परि ज्योतिष्पश्यन्त उत्तरम्।
देवं देवत्रा सूर्यमगन्म ज्योतिरुत्तमम्॥
Beholding from beyond darkness the higher light — we have reached Surya, divine god among gods, the supreme light.
Later development — Continues as a major Puranic deity. The Saura sampradaya (worshippers of Surya) became one of the six main panchayatana traditions. Konark sun temple and Modhera sun temple are dedicated to him.
Soma · सोम
Rig Veda hymns: ~120 hymns (entire Mandala 9 of Rig Veda is dedicated to Soma)
Domain: The deified plant whose juice is the central oblation of Vedic ritual. Also identified with the moon.
Function
The juice (rasa) when pressed and offered into the fire grants ecstasy and direct contact with the devas. Drunk by Indra before he slew Vritra. The poet-rishis composed under its influence.
Iconography
A young man with a kalasha of nectar; later identified with Chandra (moon) and depicted with rabbit-marked moon-disc above head.
Signature mantra · Rig Veda 9.1.1 (opening of Soma mandala)
स्वादिष्ठया मदिष्ठया पवस्व सोम धारया।
इन्द्राय पातवे सुतः॥
Flow on, O Soma, in the sweetest, most exhilarating stream — pressed for Indra to drink.
Later development — The original soma plant is now botanically lost (the most cited candidate is ephedra). In post-Vedic Hinduism, Soma fully identifies with Chandra (the moon-deva).
Vayu · वायु
Rig Veda hymns: ~15 hymns (often paired with Indra)
Domain: Wind, breath, prana. The medium of life.
Function
Sustainer of life through prana. Companion of Indra (Indra-Vayu twins). First receiver of soma after Indra (the Vayu-graha cup precedes the Indra cup at every yajna).
Iconography
Mounted on a deer (some traditions) or an antelope. Holds a banner + goad. Father of Hanuman + Bhima.
Signature mantra · Rig Veda 1.2.1
वायवायाहि दर्शतेमे सोमा अरङ्कृताः।
तेषां पाहि श्रुधी हवम्॥
O Vayu, come — beautiful in form. These somas have been prepared. Drink of them; hear our call.
Later development — Remains central as the lokapala of the north-west direction and as the father of Hanuman. In Madhva theology, Hanuman-Bhima-Madhvacharya is the Mukhya-prana lineage — Vayu incarnated thrice for the protection of dharma.
Mitra · मित्र
Rig Veda hymns: ~5 hymns dedicated; often paired with Varuna (Mitra-Varuna dual hymns)
Domain: Friend, contract, daytime sky, alliance. The benevolent twin of Varuna.
Function
Governs daytime (Varuna governs night). Guarantor of contracts + alliances + truthful speech. The very word "mitra" (friend) in Sanskrit derives from this deity.
Iconography
A young man with arms upraised in welcome. Sometimes shown holding a flag of truce.
Signature mantra · Rig Veda 3.59.1
मित्रो जनान्यातयति ब्रुवाणो मित्रो दाधार पृथिवीमुत द्याम्।
मित्रः कृष्टीरनिमिषाभि चष्टे मित्राय हव्यं घृतवज्जुहोत॥
Mitra, by speaking, unites men. Mitra has supported the earth and the sky. Mitra observes the tribes without blinking. To Mitra, offer the ghee-filled oblation.
Later development — The Aditya-aspect Mitra persists in the Surya Upasthana of daily sandhya (the mantra "Mitrasya charshanidhritah" opens the upasthana). The Iranian Mitra / Roman Mithras share Indo-Iranian origin with the Vedic Mitra.
Ushas · उषस्
Rig Veda hymns: ~20 hymns — the female deity with the most hymns.
Domain: The dawn. Daughter of Dyaus (sky). Wife of Surya.
Function
Each daily dawn is a fresh Ushas — she is always young, always virginal. Awakens the worlds, the cattle, the singers. The most poetically celebrated deity in the Rig Veda.
Iconography
A radiant young woman, rose-clad, mounted on a chariot drawn by seven red cows or red horses.
Signature mantra · Rig Veda 1.113.1
इदं श्रेष्ठं ज्योतिषां ज्योतिरागाच्चित्रः प्रकेतो अजनिष्ट विभ्वा।
यथा प्रसूता सवितुः सवायैवा रात्र्युषसे योनिमारैक्॥
This best of lights of all lights has come — a bright herald is born, far-extending. Even as she was set forth by the impulse of Savitri — so has Night yielded her seat to Dawn.
Later development — Recedes in the Puranic period. Survives in folk-tradition as the Sandhya-devi acknowledged at every sunrise sandhya-vandana. Sandhya = the gap between night and day, of which Ushas is the herald.
Saraswati · सरस्वती
Rig Veda hymns: ~30 hymns — first as a river-deity.
Domain: Originally the goddess of the Saraswati river (a major Vedic-era river, now dried up). Later: goddess of speech, learning, music.
Function
In Vedic period: the river along whose banks the rishis settled and composed the Rig Veda. The river-goddess gave Vak (speech) and Vidya (knowledge) to mankind.
Iconography
Vedic: a flowing river-form. Puranic: white-clad woman seated on a swan, holding veena + book + akshamala.
Signature mantra · Rig Veda 2.41.16
अम्बितमे नदीतमे देवितमे सरस्वति।
अप्रशस्ता इव स्मसि प्रशस्तिमम्ब नस्कृधि॥
O Saraswati — best of mothers, best of rivers, best of devis — we are like the unpraised; make us, O mother, the praised.
Later development — When the geographical Saraswati river dried up (~1500 BCE per some estimates), Saraswati transferred to Vak (speech) and Vidya (learning). Today she is one of the three principal Devis (Lakshmi, Saraswati, Parvati), worshipped especially on Vasant Panchami + during Navaratri.
Aditi · अदिति
Rig Veda hymns: ~80 mantras across hymns (no full hymn dedicated, but ubiquitous)
Domain: The infinite. Mother of the 12 Adityas (the Sun-aspects, of whom Vishnu was one in the Vedic period).
Function
"Aditi" = "not bound, unlimited". The cosmic mother — Earth, Sky, Heaven, the past, the future, all the gods all are Aditi (per Rig Veda 1.89.10).
Iconography
Has no fixed iconography — represents the unmanifest cosmic mother. Sometimes shown as a cow (the milk-giver).
Signature mantra · Rig Veda 1.89.10
अदितिर्द्यौरदितिरन्तरिक्षमदितिर्माता स पिता स पुत्रः।
विश्वे देवा अदितिः पञ्च जना अदितिर्जातमदितिर्जनित्वम्॥
Aditi is the sky, Aditi is the air, Aditi is the mother and father and son. Aditi is all the devas, Aditi is the five tribes (mankind). Aditi is whatever is born, Aditi is whatever will be born.
Later development — In the Puranic period, Aditi is the mother of the Adityas (Surya, Indra, Vamana). The Adityas number twelve (one per month). The maternal-cosmic role of Aditi merges with Devi / Shakti in the later period.
Why this matters — the most-recited mantras of modern Sanatana Dharma are Vedic — Gayatri (to Savitri / Surya), Sandhya Vandana (to Surya + Varuna + Mitra), Mahamrityunjaya (to Rudra / Tryambaka), Apo-hi-shtha (to Apah). Recognising the older devatas restores the meaning of every daily ritual. See also
Sandhya Vandana,
The Vedas, and
Navagraha Stotras (which incorporates Surya, Soma, Vayu in graha form).