From A Wiki of Ice and Fire
The Black Goat of Qohor is a god of the Free City of Qohor. The Faceless Men consider it one of the faces of the Many-Faced God.
The Black Goat is also represented in the banner of the Brave Companions, a sellsword company led by the Qohorik Vargo Hoat.
A Feast for Crows
After arriving at the House of Black and White, Arya Stark sees the statue of a shaggy black goat the size of an aurochs.
It is reported that followers of R'hllor have tried to burn the Black Goat in Qohor.
References and Notes