Bakkalon, also known as the Pale Child, is a god. There is a statue of it in the House of Black and White. The statue is most commonly visited by soldiers.
Tyrion Lannister mentions the Pale Child during the Second Siege of Meereen, as another name for death.
A Feast for Crows
After entering for the the first time to the House of Black and White, Arya Stark notices the statue of a pale infant with a sword.
Behind the Scenes
Bakkalon is also a god in George R. R. Martin's "The Thousand Worlds" science fiction universe, and is a key figure in his 1975 short story "And Seven Times Never Kill Man!"