a search for the work of Joseph Stieler
led to his Portrait of Katharina Bozzaris
daughter of Marco Bozzaris, hero of Greece
immortalized in a poem by Fitz-Green Halleck
Halleck was the first American poet to be immortalized in bronze in Central Park
a distant relative of Halleck's has written a book about him called American Byron
Halleck's longest poem was called Fanny, and in his role as America's most distinguished poet, he commented on the valorous Fanny Wright, though the homonymity seems unconnected
he loved the poet Joseph Rodman Drake virtually from their first meeting to his own death, one of his best-known works being an elegy for Drake
he wrote the last stanza of Drake's The American Flag
on which the anonymous but eminently refined scholar at
The Cambridge History of English and American Literature at the absolutely essential bartleby.com has this to say:

Halleck is said to have written the last four lines of Drake’s American Flag, a lyric full of the old-fashioned expansive and defiant Americanism, and, with its flare of imagery and blare of sound, still sure to stir the blood of any one but a professional critic. And it was on Drake, dead at twenty-five, that Halleck wrote what is the tenderest, the manliest little elegy of personal loss in American literature, beginning with the familiar lines:

Green be the turf above thee,
Friend of my better days!
None knew thee but to love thee,
Nor named thee but to praise.

the same source, and possibly the same pen, has this on Halleck:

Thus these early minor men left us some things worth keeping; but, nevertheless, taken all in all, they emphasize for us today, as they never could for their contemporaries, the relative greatness of Bryant.

geometry has some good Halleck and Drake resources
William Bryk has a detailed, concise, and wittily terse bio of Halleck at NYPress
Gregory Woods has an acerbic paragraph on Halleck at the London Review of Books

{done out of a sense of responsibility to the great crowd of bludgeoned hearts that is American poetry, and for its utility, as a weapon in the ongoing war between truth and asinine hypocrisy. Halleck's was the first statue of an American poet, 50,000 attended and the President spoke at its unveiling in Central Park. he was as gay as a three-dollar bill. yet at the same time, his relation to political 'gays' is like George Washington's to contemporary 'patriots'. it's the convoluted intricacy that appeals to me, the human condition in all its conundra.}