|Died||In 50 AC, Rimegate|
|Book||Fire & Blood (mentioned)|
Ser Olyver and his sworn brother, Ser Raymund Mallery, abandoned King Maegor I Targaryen in 48 AC when Prince Jaehaerys made his claim. Since both men had broken their Kingsguard oaths by not protecting Maegor, and Jaehaerys did not wish for oathbreakers to serve him. After taking the Iron Throne he offered them the choice of execution or taking the black, with both choosing the latter and joining the Night's Watch.
In 50 AC Olyver and Raymund led a rebellion of former Faith Militant in the Watch, trying to make themselves lords of castles at the Wall. Lord Walton Stark rode north to aid the loyal brothers with ending the mutiny. The defeated rebels at Rimegate were hanged, with the exception of Olyver, who was beheaded by Lord Stark with the Valyrian steel greatsword Ice.