Allegory is a form of extended metaphor, in which objects, persons, and actions in a narrative, are equated with the meanings that lie outside the narrative itself. The underlying meaning has moral, social, religious, or political significance, and characters are often personifications of abstract ideas as charity, greed, or envy.
Thus an allegory is a story with two meanings, a literal meaning and a symbolic meaning.

Well, this is something akin to an allegory. It's about a man who is dying, and in the course of his death, he loses the compass of his mind.

No One at the Helm

Stormy winter landscape, where
White capped waves
Wash a stony beach,
All within the minds eye,
This man is out of reach.

Cellular degeneration
In the microscopic realm,
The captain is in the forecastle
And there's no one at the helm.

The three-masted schooner
Of his body, mind and spirit,
Are hopelessly adrift, yet
He doesn't sense, to fear it.

Self induced or inorganic
The end result the same,
He won't remember where he lives
And might forget his name,
Once, the captain of the ship
That ruled the awesome seas,
Reduced to live out life
In diminishing degrees.

Fibril_late; 1997