In whose court do the Pavdavas spend their 13th year of exile in which they have to remain undiscovered?

According to the Mahabharata, the Pandavas spent their 13th year of exile in disguise at the court of King Virata of Matsya Desh. This year was known as Ajnata Vas (living in disguise). They had to remain undiscovered during this period, with each Pandava taking up different roles in the king's service. King Panchal was Draupadi's father, Krishna was their ally, and Chekitana was another warrior.