S. Coleridge

Till a great sea-bird, called the Albatross, came through the snow-fog, and was received with great joy and hospitality.
At length did cross an Albatross,
Thorough the fog it came ;
As if it had been a Christian soul,
We hailed it in God's name.
It ate the food it ne'er had eat,
And round and round it flew.
The ice did split with a thunder-fit ;
The helmsman steered us through !

And lo ! the Albatross proveth a bird of good omen, and followeth the ship as it returned northward through fog and floating ice.
And a good south wind sprung up behind ;
The Albatross did follow,
And every day, for food or play,
Came to the mariner's hollo !
In mist or cloud, on mast or shroud,
It perched for vespers nine ;
Whiles all the night, through fog-smoke white,
Glimmered the white Moon-shine.'

The ancient Mariner inhospitably killeth the pious bird of good omen.
`God save thee, ancient Mariner !
From the fiends, that plague thee thus !--
Why look'st thou so ?'--With my cross-bow
I shot the ALBATROSS.