The temple dedicated to Egyptian goddes Isis was built in the agora. It was collapsed during the reign of Augustus and was not re-built.
Sources:
- http://www.ephesus.us/ephesus/temple_of_isis.htm
- Lance Jenott, "Ancient Ephesus",University of Washington, 2004 - http://depts.washington.edu/silkroad/cities/turkey/ephesus/ephesus.html