Medallion of the Dawn

Medallion of the Dawn is an epic melee necklace, designed for non-raiding / non-pvp players. It is acquired via Argent Dawn quests turn-ins. Players in established raiding guilds can quickly earn better items; however, guilds gearing up to begin raiding for the first time may consider these rewards worth the time it takes to farm them.

Source
The quests are given by Quartermaster Miranda Breechlock. She has a quest for each tier of faction (Friendly, Honored, Revered and Exalted). It requires a turn-in of a large number of Insignia of the Dawn and Crusade.

The quests are:
 * - 110 Insignia of the Dawn and 110 Insignia of the Crusade
 * - 75 Insignia of the Dawn and 75 Insignia of the Crusade
 * - 45 Insignia of the Dawn and 45 Insignia of the Crusade
 * - 27 Insignia of the Dawn and 27 Insignia of the Crusade

Other quest rewards are: