|Alias||Jonos the Kinslayer|
|Born||In or after 16 BC|
|Died||In 37 AC, the Eyrie|
In 37 AC, at the start of the reign of King Aenys I Targaryen, Jonos rose in rebellion. He deposed and imprisoned his own brother and declared himself King of Mountain and Vale. In response King Aenys I commanded his Hand of the King, Lord Alyn Stokeworth, to sail to the Vale and deal with the usurper. That order was recalled out of fear that Harren the Red, a rebel from the riverlands, might infiltrate King's Landing.
Taking matter into own hands, Lord Allard Royce of Runestone gathered forces to sweep away Jonos's supporters, penning him at the Eyrie. However, this led Jonos to send his brother flying out of the Moon Door, earning him the nickname Jonos the Kinslayer.
Jonos and his garrison remained defiant until Prince Maegor Targaryen flew to the Eyrie atop the dragon Balerion. Rather than face the fire, Jonos was seized by his garrison and delivered to Lord Royce through the Moon Door. Surrender saved Jonos's followers from burning, but not from death. All of them were hanged per the orders of Maegor, who denied the highborn rebels the honor of beheading. House Arryn continued through a kinsman after Ronnel and Jonos' deaths, a cousin, Hubert Arryn.