San Sebastiano fuori le Mura:
Cappella Albani

Map
Cappella Albani, church of San Sebastiano fuori le Mura, Rome
High Altar
The highly ornate Cappella Albani, in the church of San Sebastiano fuori le Mura, is dedicated to Pope St Fabian (r. 236-50).

The Cappella Albani, the last chapel on the right, was built at the behest of Pope Clement XI (r. 1700-21) by Carlo Fontana (1638-1714). Following Fontana's death, the chapel was completed by Alessandro Specchi (1668-1729) and Filippo Barigioni (1690-1753). 
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How Fabian came to be pope is a curious tale. According to the fourth-century writer Eusebius, Fabian was present when the election for a new pope began, but was not thought to be in the running for the position. This all changed when a dove suddenly alighted on his head. 

To the assembled electors, this recalled the descent of the Holy Spirit on Jesus at the time of his baptism by John the Baptist. They saw it as a sign that Fabian was divinely marked out and he was at once proclaimed bishop of Rome (and thereby pope) by acclamation. 
Statue of Pope St Fabian, Albani Chapel, church of San Sebastiano fuori le Mura, Rome
Pope St Fabian
The statue of Pope St Fabian is by Pietro Francesco Papaleo (fl. 1694-1716). 
Vault, Albani Chapel, church of San Sebastiano fuori le Mura, Rome
Dome
The interior of the beautiful dome is decorated with intricate stucco work. The pendentives bear tondi containing portraits of virgin martyrs. The drum has four windows, separated by four tablets identifying the martyrs and with each topped by a crown and crossed palms