Possible tomb of Emperor Philip Arab.
Museum is located nearby.
See:
- https://terraeantiqvae.com/profiles/blogs/una-enorme-torre-encontrada-bajo-un-tumulo-en-bulgaria-podria-ser?fbclid=IwAR1VYzdUoJMt9jQInUbFVTvyCEmn_Y-Jzs4d8zNs7cXqz-jkGE98Yrf13HM#
- https://www.archaeologia-bulgarica.com/en/who-is-philip-the-arab-and-what-links-him-to-the-maltepe-mound/