The Battle of Marathon, c. 1818 (age 12).
"The Rose and Zephyr," first published work, appears in 1825 Literary Gazette.
An Essay on Mind (poems), 1826
Prometheus Bound (translation of Aeschylus), 1833
The Seraphim and Other Poems, 1838
"The Cry of the Children"published, 1842
Poems, 1844
Poems (includes the Sonnets from the Portuguese), 1850.
Casa Guidi Windows, 1851
Aurora Leigh, 1857
Poems Before Congress, 1860 Last Poems (including "De Profundis") published posthumously, 1862
Source: The Victorian Web