Aron Santagar

"Ser Aron."

- Sansa Stark greets Aron Santagar

Aron Santagar is a background character in the first season. He is played by an unidentified extra and only appears in "The Pointy End." He is a member of House Santagar, a knightly house of Dorne.

Season 1
Ser Aron is present at a court session in the Red Keep in which Janos Slynt is created Lord Slynt and given the castle of Harrenhal and later Ser Barristan Selmy is dismissed from the Kingsguard. When Sansa Stark appears to ask for mercy for her father, she greets Ser Aron, though the knight turns away.

In the books
In the Song of Ice and Fire novels, Ser Aron Santagar is the master-at-arms of the Red Keep. He's described by Ser Rodrik Cassel as a vain but honest man. In the first book, Ser Aron is secretly approached by Ser Rodrik to see if he might recognize the dagger used by the assassin sent to murder Bran Stark. He also participates in the Tourney of the Hand.