Empress

An Empress is often seen as an equivalent of a Queen for empires instead of kingdoms. It's male equivalent is Emperor.

History
The history of empresses is even more vague than queens. The term itself has been engraved in Equestrian culture, being historical empresses must have existed at some point in the distant pass. When King Sombra and the Umbrum briefly conquered the Crystal Empire, Radiant Hope was proclaimed Sombra's empress. After succumbed to the Ethical Cancer she received from her adventure in Abyssinia, she deemed herself to be the Empress of Ponyville and quickly conquered the small town by using a machine to turn all of her citizens into brainless morons while also increasing her own intelligence.

Flawless Rarity and, in an attempt to take her down from the inside, tried to align themselves with the empress to take over all of Equestria, but Twilight instead defeated both of them and decided to rule the entire world by her lonesome. However, she was cured shortly thereafter. Later, the filly Cozy Glow attempted to declare herself Empress of Friendship, but was thwarted in this ambition.

List of empresses

 * Sable Spirit as Empress of Mistmane's village
 * Ketztwctl Empress
 * Radiant Hope as Empress of the Crystal Empire
 * as the Empress of Ponyville.
 * Cozy Glow as would-be Empress of Friendship

Trivia

 * Despite the Crystal Empire consistently being referred to as an Empire, it's ruled by Prince and Princesses like a.

Appearances

 * (flash back to the events of Ponies of Dark Water)
 * (flash back to the events of Ponies of Dark Water)
 * (flash back to the events of Ponies of Dark Water)
 * (flash back to the events of Ponies of Dark Water)