Read the following poem:
It is an ancient Mariner,
And he stoppeth one of three.
"By thy long gray beard and glittering eye,
Now wherefore stopp'st thou me?
The Bridegroom's doors are opened wide,
And I am next of kin;
The guests are met, the feast is set:
May'st hear the merry din."
He holds him with his skinny hand,
"There was a ship, quoth he.
"Hold off! Unhand me, gray-beard loon!"
Eftsoons his hand dropt he.
He holds him with his glittering eye-
The Wedding-Guest stood still,
And listens like a three years' child:
The Mariner hath his will.
The Wedding-Guest sat on a stone:
He cannot choose but hear;
And thus spake on that ancient man,
The bright-eyed Mariner.
The ship was cheered, the harbor cleared.
Merrily did we drop
Below the kirk, below the hill,
Below the lighthouse top.
The Rime of the Ancient Mariner, Samuel Taylor
Coleridge
This is an example of which poetic form?