* Alexander the Great? If you are referring to the ancient Macedonian king, there are no known large sculptures of him from his own time. We have many depictions of him on coins and some smaller statues, but no large-scale ones.
* A contemporary artist named Alexander? If this is the case, please provide more information about the artist so I can assist you in finding their largest sculpture.
Once you provide more context, I can help you find the answer you are looking for.