Who's This? A pirate character at the bottom of Who's Who vol.IV, page 11.
How you could have heard of him: Captain Fear and his ship were made ghosts in John Ostrander and Tom Mandrake's Spectre, haunting the pages off issues 40 and 41 (1996), and he would later appear along with other characters in Limbo in Dr. Thirteen: Architecture & Mortality (2007).
Example story: Let's go for the first appearance and origin from Adventure Comics #425 (1972).
Though Fero's ethnicity is unique, the broad details of his origin are not. His father is shot dead before his eyes by Spanish slavers, the man's last words advising his son to resist the "white devils" at all costs. Unlike Joe Chill, who got away with it for years or forever, Fero drops his father murderer on the spot.