The albatross in Coleridge’s poem has been compared to the cross that Jesus bore to suffer for sins. This suggests that the mariner could be a Christ figure. But other Christians must “bear the cross” or suffer for their sins so to speak. So the mariner could be anyone. Or, if Coleridge saw fit to describe how the albatross was hung, that could point toward a specific saint. If the albatross were upside-down, for instance, then the mariner would be Simon Peter, who was crucified upside down. Unless the bird itself is supposed to refer to a saint.