Letter to Ellen Kilshaw
“As the slow messenger Mercury will soon bend his course toward England [...] (whether he is faithful I know not but I know he is not nearly as swift as his namesake the messenger of the gods)”
Fuller, Margaret. The Letters of Margaret Fuller. Edited by Robert N. Hudspeth. Vol. I. Ithaca: Cornell University Press, 1983.
Inferred Fuller names the ship Mercury and then deliberately glosses the mythological reference: "not nearly as swift as his namesake the messenger of the gods." This demonstrates her knowledge of Greco-Roman mythology at age 9, identifying Mercury/Hermes by his divine epithet.