“Rhiannon’s themes are movement, communication, rest, ghosts, fertility and leadership. Her symbols are the color white, horses and the moon. This Celtic horse Goddess rides into our festival calendar today on a white mare bearing fertility, leadership, and a means to get things moving where they may have stagnated. Some historians believe the swiftness of Her steed (which is white, a lunar color) alludes to a lunar Goddess. In stories, Rhiannon commands singing birds that can wake spirits or grant sleep to mortals.
In Britain, people would come to Berkshire hillside today to partake in the White Horse Festival in which they scour the white horse that adorns the grasses here. This ancient galloping steed is created from pale clay, and this ritual kept it, and Rhiannon’s memory, vibrant. So, if you have any images of horses (magazines, statuary, paintings) around, dust them off and put them in a place of honor today.
Since this was a festival for horses, you might consider tending to your own ‘horse’, be it a car or a bicycle!
Give it a tune-up or oil change, then take a ride! As you go, visualize yourself on the back of Rhiannon’s horse moving swiftly toward attending productivity or improved authority wherever you need it. Alternatively, wear something silver or white so that Rhiannon’s lunar energies can begin filtering into your day through the color’s vibrations.”
(Patricia Telesco, “365 Goddess: a daily guide to the magic and inspiration of the goddess”.)
This is pretty much a repeat of the entry I did on Rigantona back June 28.
The great Goddess 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].
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).
“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”.
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)
Nemeton, The Sacred Grove: Home of the Celtic gods, “Rhiannon, A Cymric and Brythonic Goddess, also known as Rigatona: Great Queen“.
Revel, Anita. Reconnect with Your Inner Goddess, “Rhiannon“.
Shaw, Judith. Feminismandreligion.com, “Rhiannon, Goddess of Birds and Horses“.
Sisterhood of Avalon, “The Goddesses“.
Took, Thalia. A-Muse-ing Grace Gallery, “Rhiannon“.
Took, Thalia. The Obscure Goddess Online Directory, “Epona“.