The Sorrowful Men
The Sorrowful Men belong to an ancient and sacred guild of assassins in Qarth. They are so named because they always whisper, “I am so sorry,” before killing their victims. As assassins, they are not as prestigious or expensive as the Faceless Men.
A Sorrowful Man disguised as a merchant attempted to assassinate Daenerys Targaryen in Qarth. He presented a deadly manticore to her in a jeweled box and delivered his apology before Daenerys could react, but Barristan Selmy in the guise of Arstan Whitebeard knocked the poisonous creature away before it struck and thwarted the assassination. Daenerys expressed no expectation of a second attempt by the Sorrowful Men.