|Predecessor||Qarlton Chelsted (Hand of the King)|
|Successor||Jon Arryn (Hand of the King)|
|Died||In 283 AC, King's Landing|
|Personal arms||A hand holding a torch lit with green fire and a chief lit with green flames, on silver|
Rossart was the Grand Master of the Alchemists' Guild during the reign of Aerys II, who granted him the title of Lord and a seat on the small council. He was also the pyromancer who had cooked Lord Rickard Stark in his armor, and one of the key players in the wildfire plot. During the latter stage of Robert's Rebellion, after Lord Qarlton Chelsted was burned alive, Aerys made Rossart Hand of the King. As his personal arms he chose a burning torch. As the Sack of King's Landing began, Rossart disguised as a common man-at-arms rushed to fulfill Aerys's command to burn the city down, but he was killed by Ser Jaime Lannister before he could carry out his orders, Rossart futilely tried to put up a fight.
In the recorded history, the Maesters, ignorant of the wildfire plot write that Rossart was killed while attempting to flee the castle. They do not even speculate who killed him and apparently no one even inquired.
A Clash of Kings
Hallyne the pyromancer meets with Tyrion Lannister to update him on the amount of wildfire that has been created. Tyrion is the first Hand of the King since Rossart to visit the Alchemists' Guild. Hallyne informs Tyrion that they found a cache of over three hundred jars of wildfire that had been placed beneath the Dragonpit by Lord Rossart.
A Storm of Swords
A Feast for Crows
Cersei Lannister considers appointing Hallyne as the new Hand of the King, stating he would not be the first pyromancer to become Hand. Jaime does not approve of the choice, remembering how he killed the last one.
A Dance with Dragons
Kevan Lannister remembers that after the Battle of the Bells he had expected King Aerys II Targaryen to have no choice but to summon Tywin Lannister once again, but instead Aerys had turned to Lords Chelsted and Rossart and paid for it with his life and crown.
Quotes about Rossart
Aerys: All the traitors. Rossart says they are inside the walls! He's gone to make them a warm welcome. Whose blood? Whose?.
—thoughts of Jaime Lannister
Aerys's Hand, Rossart, was killed at a postern gate after cravenly attempting to flee the castle.—writings of Maester Yandel
- A Clash of Kings, Chapter 3, Tyrion I.
- A Storm of Swords, Chapter 37, Jaime V.
- A Storm of Swords, Chapter 11, Jaime II.
- The Citadel. Heraldry: Personal Arms
- The World of Ice & Fire, The Fall of the Dragons: The End.
- A Clash of Kings, Chapter 20, Tyrion V.
- A Clash of Kings, Chapter 49, Tyrion XI.
- A Feast for Crows, Chapter 16, Jaime II.
- A Dance with Dragons, Epilogue.