This small temple on the banks of the Tiber was dedicated to the Roman god of rivers and seaports, Portunus. Originally this deity protected doors ("portus") but when the meaning of the word changed to harbor, his guardian function also changed. It was built of tufa and travertine blocks which had been originally been coated with a fine layer of stucco. It is in a good state of preservation because it was converted to a Christian church in the 9th century.
The style represents a merging of both Etruscan and Greek temple styles. Like Greek temples, it has a porch (pronaos) with free-standing columns but has only slender engaged Ionic columns on the sides and back since the cella wall is moved toward the outside--a type called the "pseudoperipteral".
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