Amos Bad Heart Bull
Amos Bad Heart Bull, also known as Waŋblí Wapȟáha (Eagle Bonnet) (ca. 1868-1913), was a noted Oglala Lakota player in what is called Ledger Art. It is a style that adapts conventional Native American pictography to the further European medium of paper, and named for the accountants' ledger books, available from traders, used by the artists for their drawings and paintings. He was after that the tribal historian of the Oglala, as his dad Bad Heart Bull (Tȟatȟáŋka Čhaŋtéšiča) was before him.