Olyvar Frey

"You will be taking on his son Olyvar as your personal squire. He expects a knighthood in good time."

- Catelyn Stark to Robb Stark

Olyvar Frey is an unseen character in Game of Thrones. He is one of the many sons of Walder Frey, Lord of the Crossing, and is a squire to King Robb Stark.

Season 1
When Catelyn Stark negotiates with Lord Frey to gain permission for her son Robb Stark and his army to pass the The Twins, one of Walder's demands is for his son Olyvar be made Robb's squire, and for him to be knighted. Robb accepts these terms.

In the books
In the A Song of Ice and Fire novels, Olyvar is the eighteenth son of Lord Walder overall and the fourth born to Lord Walder's sixth wife, Bethany Rosby. His three older brothers are Perwyn, Benfrey, Willamen, and his younger sister is Roslin. He is two years older than Robb Stark although he is very immature compared to Robb. He takes part in the Battle of the Whispering Wood.

When Robb breaks his marriage pact with House Frey, Olyvar wants to remain with him but is forced by his siblings to leave Robb. Olyvar is kept in the dark about his father's plan to betray and kill Robb Stark at the Red Wedding. It was feared that he was too loyal to Robb, and would try to warn him or even to defend him when the ambush commenced, so he is sent away from the Twins "on duty".