Question

what was vulgar done by the ancient mariner

Answer 1

in a fit of madness, the ancient mariner took his cross bow & shot the albatross,the innocent bird which brought a good south wind

Answer 2

The vulgar done by the ancient mariner is, he shot the albatross, which is the only living being living there other than the mariners, he shot the albatross. This was the vulgar done by the ancient mariner.