“Rigantona’s themes are sports, excellence, magic, fertility, movement and travel. Her symbols are horses, the moon, white items and birds. A Roman/Italic form of Rhiannon, this Goddess travels the earth on a swift white horse, a lunar symbol, sweeping us up to travel along and get everything in our lives moving! Stories portray Rigantona in the company of powerful magical birds and She also represents fertility.
In Italy, people attend the Palio Festival, a horse race that started in the 13th century and has continued ever since as a time to show physical skill and cunning. It’s a perfect place for Rigantona to shine. Any type of physical activity that you excel in will please Rigantona today and encourage Her motivational energy in your efforts. Get out and take a brisk walk, swim, rollerblade. As you move, visualize yourself atop a white horse, the Goddess’s symbol, approaching an image of a specific goal. All the energy you expend during this activity generates magic for attainment.
If birds fly into your life today, pay attention to the type of bird and its movements, because birds are Rigantona’s messengers. Birds flying to the right are good omens, those moving to the left act as a warning of danger and those flying overhead indicate productivity in whatever you try today. If any of these birds drops a feather, keep it as a gift from the Goddess.”
(Patricia Telesco, “365 Goddess: a daily guide to the magic and inspiration of the goddess”.)
Rhiannon (from the Mabinogion) by Alan Lee
Rigatona (pronounced REE at-on-a) meaning “Great Queen” is thought to be from where the Welsh Goddess Rhiannon’s original name derived. ”Continuation of the name would indicate the existence of a Brythnoic Goddess known as Rīgantona, though no trace of Her (save for the name of Rhiannon) has been left to us. Whether this Rīgantona was an independent deity or represented an aspect of Epona (who is occasionally referred to in the plural and may be a triple-Goddess) may not be known for certain though the surviving tales of Rhiannon would suggest the later interpretation. Thus there may once have been an insular Brythonic deity known as Rīgantona Epona.
Rhiannon’s name is directly cognate with the Irish goddess Mórrígan (which also menans ‘Great Queen’). In terms of attributes, however, Rhiannon is most closely similar to an sapect of the triple-Goddes, Mórrígan known as Macha; a Goddess of war, horses and kingship.” 
Rhiannon is a potent symbol of fertility, yet She is also an Otherworld and death Goddess, a bringer of dreams, and a moon deity who is symbolized by a white horse. Her father was Heveydd the Old, and She was married to both Pwyll and Manan. The story of Her marriage to Pwyll, and the subsequent accusation of the murder of Her child, is well documented and most people are familiar with Rhiannon from this tale. [Click here to read Her tale].
“Rhiannon” by Susan Seddon Boulet
Patricia Monaghan comments: “What can one expect of a Goddess of death? Her son disappeared, and the queen was found with blood on Her mouth and cheeks. Accused of murder, She was sentenced to serve as Pwyll’s gatekeeper, bearing visitors to the door on Her back; thus She was symbolically transformed into a horse. All ended happily when Her son was found; Rhiannon had been falsely accused by maids who, terrified at finding the babe absent, had smeared puppy blood on the queen’s face.
Behind this legend is doubtless another, more primitive one in which the death queen actually was guilty of infanticide. This beautiful queen of the night would then, it seems, be identical to the Germanic Mora, the nightmare, the horse-shaped Goddess of terror. But night brings good dreams as well as bad, so Rhiannon was said to be the beautiful Goddess of joy and oblivion, a Goddess of Elysium as well as the queen of hell” (p. 266 – 267).
“Rhiannon” by Jan Hess
“In Her guise as a death Goddess, Rhiannon could sing sweetly enough to lure all those in hearing to their deaths, and therefore She may be related to Germanic stories of lake and river faeries who sing seductively to lure sailors and fishermen to their doom. Her white horse images also link Her to Epona, and many scholars feel they are one and the same, or at least are derived from the same archetypal roots.
In today’s magick and ritual, Rhiannon can be called upon to aid you in overcoming enemies, exercising patience, working magick, moon rituals, and enhancing dream work.” 
“Call upon Rhiannon to bless rites of fertility, sex magick, prosperity and dream work. Work with Her to enhance divination skills, overcome enemies, develop patience, and to gain self confidence. She is most definitely a Fae that every woman can relate to on some level. Her perserverance and will is an example of what we as women are, have been, and will continue to be for millennia to come. Solid, unwavering beauty and strength, like Mother Earth below our feet.” 
General: Moon, horses, horseshoe, songbirds, gates, the wind, and the number 7.
Animals: Horse, badger, frog, dogs (especially puppies), canaries and other songbirds, hummingbirds, and dragons.
Plants: Narcissus and daffodils, leeks, pansies, forsythia, cedar and pine trees [evergreens], bayberry, sage and rosemary,[jasmine, any white flower]
Perfumes/Scents: Sandalwood, neroli, bergamot, lavender, narcissus, and geranium.
Gems and Metals: Gold, silver, cat’s eye, moonstone, crystal, quartz, ruby, red garnet, bloodstone, turquoise, and amethyst.
Colors: Dark green, maroon, gold, silver, rich brown, white, black, charcoal grey, and ruby red. 
Sphere of Influence: Animals and fertility
Best Day to Work with: Monday
Suitable Offerings: Music
Associated Planet: Moon 
Moon Phase: Waning
Aspects: Leadership, movement, change, death, fertility, crisis, magic for women, protection, strength and truth in adversity, dreams
Wheel of the Year: Willow Moon (Saille): April 15 – May 12
Ivy Moon (Gort): September 30 – October 27 
Great Goddess, help me remember that times of sorrow are opportunities for the greatest growth. Rhiannon, I affirm that I have the courage to overcome my doubts and fears.
And here’s a great 13 minute video on Goddess Rhiannon, The Great Queen
Goddessgift.com, “Goddess Symbols: Rhiannon“.
LadyRavenMoonshadow. Within the Sacred Mists, “The Celtic Tradition of Witches and Wiccans“.
Monaghan, Patricia. The New Book of Goddesses and Heroines, “Rhiannon”.
Nemeton, The Sacred Grove: Home of the Celtic gods, “Rhiannon, A Cymric and Brythonic Goddess, also known as Rigatona: Great Queen“.
Rhiannon – Divine Queen
Saille, Rowen. Order of the White Moon, “Rhiannon: Great Queen of the Celts“.
Barkemeijer de Wit, R. Celestial Journey Therapy, “Who is Goddess Rhiannon?“
Epona.net, “Later Influences of Epona“.
Goddessgift.com, “Activities to Invoke the Goddess Rhiannon“.
Goddessgift.com, “Meditations to Invoke the Goddess Rhiannon“.
Goddessgift.com, “Rhiannon, Celtic Goddess“.
Griffith, Carly. PaganPages.org, “Rhiannon“.
The Mabinogion, “Rhiannon“.
Monaghan, Patricia. The Encyclopedia of Celtic Mythology and Folklore, “Mórrígan” (p. 339 – 340)
Revel, Anita. Reconnect with Your Inner Goddess, “Rhiannon“.
Sisterhood of Avalon, “The Goddesses“.
Took, Thalia. A-Muse-ing Grace Gallery, “Rhiannon“.
Took, Thalia. The Obscure Goddess Online Directory, “Epona“.