“Batter my heart, three-person’d God”

“Batter my heart, three-person’d God” is the opening phrase of a John Donne sonnet that became a link between Jean Tatlock’s literary passions and J. Robert Oppenheimer’s naming of the first atomic-bomb test. The expression entered the story not as a technical term but through a poem Tatlock loved and shared with Oppenheimer; years later, he drew on it when assigning the test its code name, “Trinity.”

Source and Transmission

Tatlock, the daughter of Berkeley Chaucer scholar John S. P. Tatlock, had absorbed her father’s literary sensibilities and favored the dark, morose verse of Gerard Manley Hopkins. She also loved Donne’s poems. Oppenheimer quickly recognized this literary inheritance when they met, and Donne’s work became one of the passions she passed on to him.

From Poem to Code Name

Years after Tatlock introduced him to Donne’s poetry, Oppenheimer turned to the sonnet beginning “Batter my heart, three-person’d God” for inspiration in naming the first atomic-bomb test “Trinity.” The expression’s significance lies in that passage from private literary exchange to the language of the bomb project: a poem associated with Tatlock became the source of a name Oppenheimer gave the test.