Seven Saints

Nave, Basilica di San Giulio
(on the Isle of San Giulio, Piedmont, Italy)

Except for Catherine's, all the saints' names are given next to their haloes, and they are also identifiable by their attributes:

Read more about Saints Cosmas and Damian, Sebastian, Roch, James the Greater, Catherine, and Blaise.

Source: Wolfgang Sauber via Wikimedia Commons

Source of dating: Italian Wikipedia, s.v. "Basilica di San Giulio"