The archaeological site in the Perossi House, now the Volsonis hospitality venue, reveals late antique segments of city walls dating back to the 3rd or 4th century ad, including remnants of a tower. As was customary across the Roman Empire, these walls were constructed using funerary monuments from ancient necropolises, two altars, and frieze fragments from one or more cult buildings. These finds likely indicate the presence of late antique western city gates defended by towers.

Within this archaeological complex is a well-preserved presumed altar from the Temple of Venus, dating to the 1st century bc. This temple, the only one dedicated to the Roman goddess of love and beauty along the eastern Adriatic coast, can be seen on the ground floor of a Renaissance house on Bishop Antun Mahnić Street, now home to the shop Memento Venerem.

In 1963, an archaeological sensation was discovered on the ground floor of a private house on the modest Fishermen’s Street (Ribarska ulica), which leads from the main city square to the Small Gate. A black-and-white Roman mosaic, stylistically dated to the 1st or 2nd century ad, was unearthed. This mosaic is a testament to the influence of Western culture and Roman civilisation on the island and city of Krk.

The central figure of the composition is Triton, a mythological being with a human upper body and a fish-like lower body. He is a lower sea deity, the son of Poseidon and the sea goddess Amphitrite – a Nereid. It is surrounded by depictions of marine fauna, dolphins, and stylised fish. It is believed that Triton is one of four figures in the mosaic, two of which are partially preserved – possibly an Ichthyocentaur and Pan – while the fourth figure was destroyed in later renovations. The mosaic likely depicted a maritime feast.

Triton, often portrayed as a half-man, half-fish riding on a dolphin, was a common motif for fountains and ships. He was revered by sailors and coastal residents for his ability to calm or stir the sea by blowing into a conch shell, as noted by Ovid.

This ancient site is currently undergoing conservation and restoration efforts, which aim to establish a new interpretive centre.