Joseth is the master of horse at Winterfell upon the departure of Hullen. He is a stick-thin man. He has twin daughters, Bandy and Shyra.
After Tyrion Lannister's visit, Joseth trains Dancer to Tyrion's specification so that Bran Stark can have the ability to ride.
Bran sends Joseth a huge lobster during the harvest feast for seeing to Dancer's training.
When Bran and Rickon Stark disappear, Joseth is forced to join Theon Greyjoy's search party.