A Feast for Crows
After entering the House of Black and White in Braavos for the first time, Arya Stark notices the statue of a pale infant with a sword. The statue of Bakkalon is most commonly visited by soldiers.
The Winds of Winter
This information has thus far been released in a sample chapter for The Winds of Winter, and might therefore not be in finalized form. Keep in mind that the content as described below is still subject to change.
Behind the Scenes
Bakkalon is a god in George R. R. Martin's "Thousand Worlds" science fiction universe. In Martin's 1975 short story "And Seven Times Never Kill Man", the deity is worshiped by the Steel Angels, a military-religious sect.