Glossa Ordinaria
Catena Aurea · Johannesevangelium 19
But the Jews cried out, saying, If thou let this man go, thou art not Cæsar’s friend: whosoever maketh himself a king speaketh against Cæsar. When Pilate therefore heard that saying, he brought Jesus forth, and sat down in the judgment seat in a place that is called the Pavement, but in the Hebrew, Gabbatha. And it was the preparation of the passover, and about the sixth hour: and he saith unto the Jews, Behold your King! But they cried out, Away with him, away with him, crucify him. Pilate saith unto them, Shall I crucify your King? The chief priests answered, We have no king but Cæsar. Then delivered he him therefore unto them to be crucified.
The tribunal is the seat of the judge, as the throne is the seat of the king, and the chair the seat of the doctor.