A Valentine

For her this rhyme is penned, whose luminous eyes, 
Brightly expressive as the twins of Leda, 
Shall find her own sweet name, that nestling lies 
Upon the page, enwrapped from every reader. 
Search narrowly the lines!- they hold a treasure 
Divine- a talisman- an amulet 
That must be worn at heart. Search well the measure- 
The words- the syllables! Do not forget 
The trivialest point, or you may lose your labor 
And yet there is in this no Gordian knot 
Which one might not undo without a sabre, 
If one could merely comprehend the plot. 
Enwritten upon the leaf where now are peering 
Eyes scintillating soul, there lie perdus 
Three eloquent words oft uttered in the hearing 
Of poets, by poets- as the name is a poet's, too, 
Its letters, although naturally lying 
Like the knight Pinto- Mendez Ferdinando- 
Still form a synonym for Truth- Cease trying! 
You will not read the riddle, though you do the best you can do.

Edgar Allan Poe
A kind of acrostic. The first letter from the first line, the second letter from the second line, the third letter from the third line, etc. spells Frances Sargent Osgood.