MacKeth was a gutter rat from a major port city. At a young age, he was press-ganged to serve on a navy vessel for the last years of a war. While still a youth, he found he had a knack for sailing and loved the sea, and without any other skills, looked for work as a ship hand.
A young half-orc had few opportunities on legitimate vessels, so he mostly worked for smugglers, though he never went as far as to serve on pirate vessels. He learned how to fight through the years, defending himself from other gangs or some particularly vicious members of his own crews.
His last job went wrong. He had been working with the same ship and crew for a few years, and things were stable. However, guards ambushed the ship while they were delivering a shipment. Several crewman were killed, and while the rest escaped with the ship, the goods and payment were lost. He is heading to a tavern to drink away the faces of his dead friends.