Daniel Hale Williams performed in 1893 a pioneering operation on a chest wound involving the heart, on a patient who survived for years. The operation — usually described as suturing of the pericardium and control of vascular injuries near the heart — holds a central place in the debate over the origins of cardiac surgery. Its importance to Wikinventia lies both in the surgical fact itself and in how it was marginalized: Williams was African American, worked outside the European academic circuit, and his case remained outside the specialty's institutional memory for decades.