Porphyry sculpture known as The Tetriarchs, a fourth century work from Egypt, now at the foot of the Basilica of St. Mark's.

Porphyry sculpture known as The Tetriarchs, a fourth century work from Egypt, now at the foot of the Basilica of St. Mark's.

MERVYN REES / Alamy Stock Photo

Image ID: DJ0X4C

Porphyry sculpture known as The Tetriarchs, a fourth century work from Egypt, now at the foot of the Basilica of St. Mark's.

Location: Foot of St. Mark's Basilica, St Mark's Square, Venice, Italy