This is a Qeynos Bounty quest for raising Qeynos Faction for citizenship.
It starts by talking to Gil McMartin outside the West Freeport gates. He sends you to kill Kuestral, a Centaur in the Thundering Steppes.
Kuestral will spawn near 1232,2.6,372 as a single arrow up solo mob at the level of the quest holder.
Kill Kuestral and return to Gil McMartin in the Commonlands to collect your Bounty.