Ronnel Arryn (king)
|Alias||The King Who Flew|
King of Mountain and Vale|
Lord of the Eyrie
Warden of the East
|Died in||37 AC or shortly after, at the Eyrie|
|Royal House||House Arryn|
|Mother||Queen Regent Sharra Arryn|
The World of Ice & Fire (mentioned)|
Fire & Blood (mentioned)
The Sons of the Dragon (mentioned)
Ronnel Arryn was the last King of Mountain and Vale, reigning until the invasion of Westeros by Aegon the Conqueror. Only a boy, rule of the Vale of Arryn fell to his mother, Queen Regent Sharra Arryn, who was regarded as one of the most beautiful women of Westeros.
King of Mountain and Vale
After Aegon launched his invasion and made his intentions known to the rulers of the seven independent kingdoms of Westeros, Sharra sent a portrait of herself to him and offered her hand in marriage with the condition Aegon would make her son his heir. Aegon refused.
The Vale scored a victory against the invaders in a battle in the waters off Gulltown, though the Arryn fleet was burned by Visenya Targaryen. However, after the Arryn fleet was destroyed, the Lord of the Vale faced a new problem, as the Sistermen revolted against the Eyrie.
As other regions of Westeros fell to Aegon, Ronnel's mother Sharra amassed the Vale army at the Bloody Gate. However, Aegon sent Visenya to the Eyrie atop her dragon Vhagar. When the queen regent returned to the Eyrie she found her son sitting on Visenya's lap asking if he could ride the dragon with Visenya. Sharra afterward bent the knee. The Arryns were declared Wardens of the East and Defenders of the Vale, and Ronnel received his ride on Vhagar. And so ended the last reign of the Kings of Mountain and Vale.
Lord of the Vale
Ronnel became Lord of the Vale during the reign of King Aegon the Conqueror, a position he held throughout the Conquerers thirty-seven year reign. He was nicknamed "the King Who Flew" for the ride he has on Vhagar as a boy. Queen Rhaenys Targaryen arranged the marriage of Lord Ronnel to the daughter of Lord Torrhen Stark.
Upon the death of Aegon the Conqueror, however, and the ascension of his son Aenys to the Iron Throne, rebellion broke out in Westeros, including the Vale. Ronnel's own brother Jonos Arryn rose in rebellion against him. Ronnel was imprisoned and his title usurped by Jonos.
House Royce of Runestone led by Lord Allard Royce gathered forces to sweep away Jonos and his supporters, penning him at the Eyrie. Ronnel was executed by his brother who had him flung out of the Moon Door, earning him the nickname Jonos the Kinslayer. Ronnel's death added a dark twist to his nickname, "the King Who Flew".
Jonos and his men remained defiant until Prince Maegor flew to the Eyrie upon Balerion to crush the rebellion. Jonos' followers, knowing they could not defeat the dragon, turned on their leader. Jonos shared the same fate he had shown to his brother Ronnel and was flung through the Moon Door. His men hoped that by surrendering, Prince Maegor would show them mercy. Maegor's mercy was having all of them hanged instead of being burned alive. Even the highborn died by the noose as Maegor denied them the honor of beheading. House Arryn continued after the deaths of Ronnel and Jonos; their cousin, Hubert Arryn became the new Lord of the Vale. 
—Ronnel to Sharra Arryn