This is a reproduction of an altar found in Scotland.

The original was made (or commissioned) by Marcus Cocceius Firmus, a centurion of the Second Legion Augusta.

Altars such as this were either made before battle asking for help in the coming fight, or after as a thanksgiving.

This example was found near the fort headquarters, often they were sited in a temple. Incense was burnt in the top. It was believed that the smoke carried the message to heaven - in this case to Jupiter.

Marcus survived his years in the army and returned home to the Black Sea.

Follow this link for an altar found in Caerwent. Probably erected by an optio from Caerleon's Roman legion.