From A Wiki of Ice and Fire
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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.
|Book||The Winds of Winter (appears)|
Marro is a mummer in Braavos. He is part of the mummer's troupe at the Gate.
The Winds of Winter
Marro plays the part of the Stranger in The Bloody Hand. As the troupe prepares for the start of the play, he tells Mercy to bring paste as his horn is coming loose. Mercy fetches the sticky paste and fastens the Stranger’s left horn back onto his forehead. Marro is in the opening lichyard scene with Bobono.
By then Marro had appeared behind him, gaunt and terrible in the Stranger's long black robes. His face was black as well, his teeth red and shiny with blood, while ivory horns jutted upwards from his brow. Bobono could not see him, but the balconies could, and now the pit as well. The Gate grew deathly quiet. Marro moved forward silently.