This is part of a Roman central heating system which acted like a wall radiator. It is a hypocaust flue tile. Heat from a fire or furnace would travel under flooring and inside of walls to enter rooms through vents. The heat would travel through spaces inside of tiles like the one depicted above.

This object was chosen and photographed by Somerton Primary School to complement their video about Saturnalia. This was part of the 2016 Kids in Museums Takeover Day at the National Roman Legion, Caerleon.