From A Wiki of Ice and Fire
The Red Book is a history of the fighting pits of Meereen. It was written by an unknown Yunkish man and translated centuries later by Maester Elkin. The Red Book mentions that many Ibbenese women who had been sold into slavery ended their days in the fighting pits of Meereen, Yunkai, and Astapor. The slavers considered them too ugly to serve as bed slaves and too savage to be used as field hands.
- ↑ The World of Ice & Fire, Beyond the Free Cities: Ib.