Courier (Skyrim)

Couriers bring messages to the player, often activating certain quests.

Oblivion
In, a female Imperial, whose name is unstated in the game, is named Courier. She rides a Black Horse around Cyrodiil, delivering the copies of the Black Horse Courier. She hands out a random copy from the Black Horse Courier every time you speak to her. She is usually found riding on the roads of Cyrodiil, but sometimes in the woods or somewhere further running away from an enemy.

Skyrim

 * In Skyrim, a courier brings the Dragonborn a letter for the first time, after he or she uses a Dragon shout in a public place. This activates a Radiant Story quest, in which the Dragonborn learns the locations of new Word Walls.
 * Couriers also bear Letter of Inheritance when someone close to the Dragonborn dies. Often these letters are accompanied by various sums of gold.
 * After killing Grelod the Kind for Aventus Aretino, a courier brings a Mysterious Note to the Dragonborn from the Dark Brotherhood.
 * Couriers can also bring letters to the Dragonborn when the player aquires certain enchanted weapons from vendors. These quests usually ask the Dragonborn to deliver said weapon to a rich researcher who offers suitable reward for bringing him the item.
 * Courier letters trigger follow-up quests for The Man Who Cried Wolf and The White Phial (The Wolf Queen Awakened and Repairing the Phial, respectively).
 * You can steal a letter from the courier which will give you the location of a word wall.

Bugs

 * Occasionally, the courier delivers messages wearing nothing but just shoes.