A moratorium is in effect on adding information from Fire and Blood until December 20th.
A Storm of Swords (appears)|
A Feast for Crows (mentioned)
A Storm of Swords
Mors, accompanied by his brother, Dickon, his father Lord Dagos and his uncle Ser Myles, were part of the entourage of Prince Oberyn Martell when he came to King's Landing to claim the seat on the small council that Tyrion Lannister had offered the Prince of Dorne, Doran Martell.