Standing in the main Agora (market place) was the governor's judgement seat. This is the location of Paul's trial before the proconsul Gallio. The governor's judgement seat stood in front of this wall. The seat has an inscription saying “rostra”, the Latin term for the Greek "bema". (Acts 18:12-17).
The rather worn carving in the foreground is of an ox garlanded with flowers. When Paul and Barnabas were in Lystra, the priest brought oxen with garlands of flowers as a sacrifice, thinking that Paul and Barnabas were the gods Hermes and Zeus. This was in response to them healing a crippled man (Acts 14:8-14).