Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
It was the custom of the Roman governors to erect their tribunals in open places, as the market-place, the circus, or even the highway. Pilate caused his seat of judgment to be set down in a place called "the Pavement" (Jn. 19:13
) i.e., a place paved with a mosaic of coloured stones. It was probably a place thus prepared in front of the "judgment hall."
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.