|Alias||Jonos the Kinslayer|
|Book(s)||The World of Ice and Fire (mentioned)|
During the reign of King Aenys I Targaryen, Jonos rose in rebellion and imprisoned his own brother. Aenys commanded a host to sail to the Vale and deal with the usurper, but recalled it out of fear that Red Harren might infiltrate King's Landing.
House 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. Prince Maegor flew to the Eyrie atop his dragon Balerion. Jonos and all of his followers were hanged by Maegor. House Arryn continued through a kinsman after Ronnel and Jonos' deaths, a cousin, Hubert Arryn.