The Seneschal of Tyrsis is an official and administrator of the city under King Balinor Buckhannah. He is snide, sarcastic and rude, and also xenophobic; by his orders, no Elves or Dwarves were permitted to enter the city. He considered hero Shea Ohmsford a "half-breed" because of his Elven ancestry.
He doesn't allow Jak Ohmsford and Shella Leah to meet with the king, until Shella showed him the royal locket signifying she is the princess of Leah. They also had to "threaten" him with their company, in order to unlock a cabinet and get access to the mystic book of Stenmin.