|Title||Prince of Dorne|
|Book(s)||The World of Ice & Fire (mentioned)|
During the War of Conquest, Dorne had defied the Targaryens and their dragons, but in 4 ᴀᴄ, King Aegon began his campaign on Dorne, in an attempt to finalize his Conquest. This First Dornish War would last until 13 ᴀᴄ.
In 13 ᴀᴄ, Nymor's mother, Princess Meria Martell, the Yellow Toad of Dorne, died, and Nymor inherited the rule of Dorne. Already old and failing, Nymor wanted peace, so he send a delegation, led by his daughter and heir, Princess Deria Martell, to King's Landing, to negotiate a peace with King Aegon I - a peace between two Kingdoms, two equals, not a peace between a vassal and its overlord.
Deria indeed suggested the peace, and it is said that King Aegon was about to refuse, when she handed him a letter from Nymor. King Aegon read the letter (and clenched it so hard his hands started to bleed), burned it once finished, and flew to Dragonstone on Balerion without a word. When he returned the next morning, he agreed to the peace and signed a treaty.
It is unknown what the contents of the letter was that Nymor had written, but maesters have speculated. Had Nymor revealed to Aegon that his beloved sister-wife, Queen Rhaenys, had not died at Hellholt, but was still alive, mutilated and broken, and had the offer been that Rhaenys' suffering would be ended if Aegon agreed to the peace? Or did Nymor threaten to hire a Faceless Man to kill Aegon's young son and heir, Prince Aenys?