Maynard is a Knight of the Vale and a member of House Moore. He is also a member of the Brotherhood of Winged Knights, earning his place in the resurrected order in 510 AC. His squire is a teenage boy named Jasper Lynderly.
Ser Maynard remained at the Gates of the Moon during Sunderland's Rebellion. He was acting commander for the remaining brothers and sworn to protect the daughters of Nathaniel Arryn as well his lesser kin. Meanwhile, Commander Egen led the other brothers in the Sisters with Lord Arryn.