Viera Lerus

Viera Lerus is a female Imperial and Captain of the Bravil City Watch. She will fight in the Defense of Bruma if you complete the Bravil part of Allies for Bruma; if she has died, you can´t complete the Bravil part of the quest. In the Thieves Guild quest Arrow of Extrication, you'll earn a blood price if you kill her, but that can be avoidable.

Quests

 * Allies for Bruma
 * Defense of Bruma

Bugs
Viera is captain of the Bravil City Watch, but she is not a member of the Guard class. So she is unable to arrest you if you commit any crimes (although her high responsibility ensures that she immediately reports any crimes she may witness), and she can´t give you any directions about places in the city of Bravil.