According to ancient Roman maps, St. Stephen's School is built over the ruins of the Roman temple dedicated to goddess Bona Dea.

In Roman mythology, Bona Dea (literally "the good goddess") was the goddess of fertility, healing, virginity, and women. She was the daughter of the god Faunus and was often referred to as Fauna.
Bona Dea was the perpetually virginal goddess and was also associated with healing, with the sick being tended to in her temple garden with medicinal herbs. She was regarded with great reverence by lower-class citizens, slaves and women who sought her aid in sickness or for fertility.

She was worshipped in a temple on the small Aventine Hill, but her secret rites were performed in the home of a prominent Roman magistrate. The rites were held on December 4, and were attended by women only. Even paintings or drawings of men or male animals were forbidden, along with the words "wine" and "myrtle" because she had once been beaten by Faunus with a myrtle stick after she had become inebriated. The rites were conducted annually by the wife of the senior magistrate present in Rome assisted by the Vestal Virgins. The most famous anecdote related to this festival was its desecration by Publius Clodius in 62 BC when he surreptitiously attended the ceremony at the house of the pontifex maximus, Julius Caesar. During the ensuing trial, the alibi of Clodius was demolished by Cicero, which caused the perpetual animosity that would define their relationship for the rest of their lives.

Bona Dea is usually depicted sitting on a throne, holding a cornucopia. The snake is her attribute, a symbol of healing, and consecrated snakes were kept in her temple at Rome. Her image frequently occurred on ancient Roman coins.

Micha F. Lindemans. "Encyclopedia Mythica". Brief history of Bona Dea.