Israel's 1982 invasion of Lebanon was a pivotal moment in global history, transforming the fate of Palestinian self-determination, Lebanese and Israeli politics, Israel's regional relationships, diaspora Jewish perceptions of Zionism, and western policy across the Arab world. Yet it has often been elided in public discourse and scholarship—a result of selective amnesia, political convenience, and the difficulty of research across national divides. In a contemporary moment of profound rupture—and especially in light of the ongoing war in Gaza—how can we make sense of this contested past and its multiple legacies?