Also becoming familiar before the end of the Republic was travertine, a
calcareous limestone found in large quantities near Bagni on the road to Tivoli. Soft
when quarried, it hardened quickly and is a lovely white or light yellowish colour.
The colonnade of ST PETER'S was to be built of this. Brick was not used in wall
construction until the days of the Empire, but brick tiles were used in roofing for six
centuries B.C.
calcareous limestone found in large quantities near Bagni on the road to Tivoli. Soft
when quarried, it hardened quickly and is a lovely white or light yellowish colour.
The colonnade of ST PETER'S was to be built of this. Brick was not used in wall
construction until the days of the Empire, but brick tiles were used in roofing for six
centuries B.C.
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