|In 50 AC, Rimegate
Ser Olyver and his sworn brother of the Kingsguard, Ser Raymund Mallery, abandoned King Maegor I Targaryen in 48 AC when Prince Jaehaerys made his claim for the Iron Throne. 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 throne he offered them the choice of execution or taking the black. They both chose to join the Night's Watch.
The Lord Commander of the Night's Watch gave Ser Olyver command of Rimegate and Ser Raymund command of Sable Hall, with orders to restore the crumbling forts of the Wall. However, in 50 AC, Olyver and Raymund led a rebellion of former Faith Militant in the Watch, trying to make themselves lords of their castles. 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.