Are there legitimate saints not documented in western hagiology?

In Croatia the patron saint of Vukovar is Saint Bonus/Sveti Bono. There's nothing in any English Catholic encyclopedia but Croatian wikipedia lists the following facts: * Martyred under Decian (or was it Valens?) in the third century * There's an inscription of his name on a street in Rome. * His body was donated to the people in Vinkovski by Benedict XIV How common is it for saints of one region to be "left out" in the English hagiographies?