Alicorn

Alicorns are a rare species of known to inhabit Equestria.

Biology
Alicorns are a fusion of the three primary tribes of Pony:, , and. They thus possess the strength of an Earth Pony, the wings and weather magic of a Pegasus, and the horns and magic of a Unicorn. Alicorn magic is considerably stronger than normal Unicorn magic, with a single Alicorn being capable of moving the sun or moon when it would take a group of Unicorns to do the same. Alicorns-most notably Princess Celestia-also tend to be larger than typical adult ponies, and with larger wings and longer horns that Pegasi or Unicorns.

Ponyland

 * Dazzleglow

Equestria

 * Four Princesses of Equestria
 * Princess Celestia
 * Daybreaker (dream world)
 * Princess Luna
 * Nightmare Moon
 * Princess Cadance
 * Flurry Heart
 * Big McIntosh (dream world)
 * Queen Parabola
 * Cloudsdale Alicorn
 * Sunset Shimmer (vision)
 * (in Twilight Sparkle's imagination )
 * Eclipse (temporarily)
 * Cozy Glow (temporarily; two versions)
 * (temporarily; as the "Princess of Chaos")
 * Decepticolt, Goldcap and Zappityhoof (temporarily)
 * Decepticolt, Goldcap and Zappityhoof (temporarily)

Minor unnamed alicorns

 * A blue, gray-maned, pink-eyed unicorn appears in
 * A gray, purple-maned alicorn who appears to be a mare appears in
 * A pink, blue-maned alicorn mare appears in

Mirror Universe

 * Princess Celestia (Mirror universe)
 * Princess Luna (Mirror universe)
 * Princess Cadance (Mirror universe)
 * Princess Trixie

Equestria (Deviations)

 * Princess Celestia (Deviations)
 * Princess Luna (Deviations)
 * Nightmare Moon (Deviations)

Eris' dimension

 * Princess Celestia (Eris's dimension)
 * Princess Luna (Eris' dimension)
 * Princess Trixie (presumed)

Shadow Realm

 * Princess Argent
 * Princess Solar

Unknown universe

 * Daybreaker
 * Nightmare Moon

Merchandise

 * Cosmos
 * Léon
 * Princess Gold Lily
 * Princess Skyla
 * Princess Sterling

Etymology and history
The term "alicorn" has been used to describe winged unicorns since at least the 1930s with Odell Shepard's The Lore of the Unicorn, however as that book referenced older alchemy works, it is likely the term is far older. Otherwise, the name of alicorn was often used to describe the horn of a unicorn, a magical object widely believed to be true in ancient Europe and Asia.

Alicorns and power
Alicorns were often seen as symbols of power in Friendship is Magic, with the majority of alicorns being seen in posisitions of power such as being princesses or queens. In a handful of instances, such as Reflections and The Fall of Sunset Shimmer, the idea of a pony becoming an alicorn was synonymous with them becoming a ruler. Likewise, it seems that ponies aspire to become alicorns to some extent, as both Pinkie Pie and Gozy Glow became alicorns when they gained Discord's chaos magic.

Error-based alicorns
Over the years, a number of ponies have been erroneously depicted as alicorns. These characters include:
 * Fleur de Lis - "Canterlot Boutique"
 * Lemon Hearts - "Rainbow Falls"
 * Mulberry Flowers" - "A Matter of Principals"
 * Neon Lights - "Rarity Takes Manehattan"
 * - "Pinkie Pride"
 * Rivet - "Grannies Gone Wild"
 * - "Newbie Dash"
 * Steam Roller - "Grannies Gone Wild"
 * Princess Erroria - various