How can i delete the 13.2gb photo library off of my phone?

I have already gone through the creating an empty folder and synced just that folder and when that didn't work I unselected the box to sync photos and that also did not resolve my issue. I'm at a loss on how to remove the data from my iPhone5. I currently have 250 photos/videos on my phone that are just over 2gb...I would really appreciate help clearing out such a large portion of my harddrive