From A Wiki of Ice and Fire
The Sorrowful Men are an ancient guild of assassins operating on the city of Qarth. Each one whispers "I am so sorry" to their victims before they kill them.
A Clash of Kings
In Qarth a member of the Sorrowful Men makes an attempt on Daenerys Targaryen's life using a manticore, only to be thwarted by Arstan Whitebeard.
A Storm of Swords
Aboard the Balerion Daenerys Targaryen dwells upon her enemies and remembers that the warlock Pyat Pree had sent a Sorrowful Man after her to avenge the Undying she had burned in their House of Dust. She remembers that it is said that Sorrowful Men never failed to kill.
- ↑ A Clash of Kings, Chapter 40, Daenerys III.
- ↑ A Clash of Kings, Chapter 63, Daenerys
- ↑ A Storm of Swords, Chapter 8, Daenerys I.