Nicene and Post-Nicene Fathers, Ser. II, Vol I:
The Life of Constantine with Orations of Constantine and Eusebius.: Chapter XXXV

Chapter XXXV.—Description of the Atrium and Porticos.

The next object of his attention was a space of ground of great extent, and open to the pure air of heaven. This he adorned with a pavement of finely polished stone, and enclosed it on three sides with porticos of great length.