Towards the end of your racial diplomacy tutorial quests players can recieve a free mount, the Young Courier Horse.
Isle of Dawn players will be led to a quest involving the gray knights that will result in the same horse reward plus a prestigous bauble. You can find 3 versions of this quest in each of the three areas that are your choices to teleport too from the isle of dawn by using the riftway.
They are Diplomat's Saga: Kojani Storms (Kojan), Diplomat's Saga: The Thestran Dead (Thestra) or Diplomat's Saga: Sands of Qalia (Qalia)
There are quests for each continent that reward the Tier 2 mount. On Thestra it starts with Deliver the Proclamations. On Kojan it is A Poet's Request. On Qalia it is Deliveries for Haftan.
There are also two books that upgrade your mounts. The Courier Horse Basic Training Manual upgrades your Young Courier Horse to a Matured Courier Horse. The Courier Horse Advanced Training Manual will upgrade your Matured Courier Horse to a Trained Courier Horse. Currently it is the only way to get the Tier 3 diplomacy horse. You must be level 30 to use the Tier 3 book however. They are both rare, random drops from civic diplomacy parleys.
A good source of diplomacy mount quest information can be found at
http://www.vgtact.com/wiki/index.php/Category:Diplomatic_Mount_Quests
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