New-York Daily Tribune
“Christmas” · December 25, 1844, December 1844“the two boys were as content in their relation as Michael Angelo with his Urbino.”
Fuller, Margaret. Life Without and Life Within; or, Reviews, Narratives, Essays, and Poems. Edited by Arthur B. Fuller. Boston: Brown, Taggard and Chase, 1860. · p255
Inferred Fuller alludes to Michelangelo's bond with his servant Francesco Amadori (Urbino), who served him for over 25 years.