The design of the letters on this inscription display late characteristics (G) as well as earlier practices (II instead of E). It is local work of poor quality, dating to the late 2nd century or the first half of the 3rd century. However, by its shape this altar belongs to the same typology as the following piece. The fact that it was given to the Genius of the Basilica is testimony to the importance of the cult of the Genius, which spread throughout Lusitania from the first quarter of the 1st century.The lower half of the piece is lost leaving the inscription incomplete. The letter S, still legible on the third line, can be interpreted as belonging to the sacrum formula, or to the name of the person who dedicates this small altar to fulfill a vow.