(Collecta: S. Vitus)
(Image source)
From the Churches of Rome wiki:
Sant'Eusebio is an ancient church dedicated to St Eusebius of Vercelli, a 4th century bishop.
The church... is first mentioned in 474. This means that it's one of the oldest churches in Rome; it was one of the first parish churches known as the Titulus Eusebi.
The interior was rebuilt by Pope Gregory IX in 1238.
The exterior was altered in the 18th century, and the interior was changed in the 17th and 20th centuries. The Romanesque style from the 13th century was preserved.
[...]
The relics of St Eusebius of Bologna, who financed the church, are interred beneath the high altar.
