Nobility in Ishgard

[Khalithar]

Hyur, and just about anyone in Ishgard, can become a minor noble after killing a legit dragon. Once you do that, you and your descendants are pretty much set.

This is also touched upon in a few different quests, kill a big and badass enough dragon and you'll become a noble. It's pretty apparent that most that try this usually die horribly in the attempt though. But theoretically, some Hyur soldier that managed to kill some huge dragon and return with it's head as a trophy would probably receive a fair bit of accolades/rewards.