Summary from Wikipedia:
“She Walks in Beauty” is a poem written in 1814 by Lord Byron. One of Lord Byron’s most famous, it is a lyric poem that describes a woman of much beauty and elegance. The poem appears to be told from the view point of third person omniscient. There are no hints as to the identity of the narrator, but it is believed that the narrator may be Byron himself. The poem is said to have been inspired by the vision of Byron’s cousin by marriage in a mourning gown. It was the first of several poems to be set to Jewish tunes from the synagogue by Isaac Nathan, which were published as Hebrew Melodies in 1815.
Full text:
She walks in beauty, like the night
Of cloudless climes and starry skies;
And all that’s best of dark and bright
Meet in her aspect and her eyes:
Thus mellow’d to that tender light
Which heaven to gaudy day denies.
One shade the more, one ray the less,
Had half impaired the nameless grace
Which waves in every raven tress,
Or softly lightens o’er her face;
Where thoughts serenely sweet express
How pure, how dear their dwelling-place.
And on that cheek, and o’er that brow,
So soft, so calm, yet eloquent,
The smiles that win, the tints that glow,
But tell of days in goodness spent,
A mind at peace with all below,
A heart whose love is innocent!