The former US president Jimmy Carterdied, at the age of 100, just before news of an imminent deal to free the last of Israel’s hostages in Gaza. Carter’s presidency was crippled by his own hostage crisis, American diplomats held captive in Tehran. Freeing them became his administration’s highest priority, and he worked on it for every single one of the 444 days the crisis lasted, often to the exclusion of anything else.