hostage, person held by another as a guarantee that certain actions or promises will or will not be carried out. During periods of internal turmoil, insurgents often seize hostages; recent examples include seizures of Americans and other foreigners by militants in Iran (1979-81) and Lebanon (1980s). Military forces often take hostages among civilians in an occupied country, in order to ensure the delivery of requisitions, to discourage hostile acts, or to take reprisals for hostile acts committed by unknown persons. In World War II, thousands of hostages were executed throughout Europe by the German authorities in an attempt to crush resistance movements. The Geneva Convention of 1949 forbade entirely the taking of civilian hostages. Criminals, especially when confronted by police, sometimes take hostages as "human shields" or as bargaining assets. In 1998 it was revealed that Israel was holding Lebanese hostages solely for use in prisoner exchanges or other deals with Lebanese guerrillas; their detainment was condoned by Israel's supreme court.

Ancient military custom regulated the behavior and treatment of hostages; originally a hostage was a person who had been delivered by one authority to another as a token of good faith, and was generally treated as an honored guest. However, he might be imprisoned or even executed if the agreement guaranteed by his person was broken. The code of honor was often very strictly observed in feudal times; thus, during the Hundred Years War, when the hostages sent to England in exchange for the release of John II of France escaped, King John felt bound to return to captivity in England. Until the 18th cent., hostages were often exchanged when treaties were concluded.

Iran hostage crisis, in U.S. history, events following the seizure of the American embassy in Tehran by Iranian students on Nov. 4, 1979. The overthrow of Muhammad Reza Shah Pahlevi of Iran by an Islamic revolutionary government earlier in the year had led to a steady deterioration in Iran-U.S. relations. In response to the exiled shah's admission (Sept., 1979) to the United States for medical treatment, a crowd of about 500 seized the embassy. Of the approximately 90 people inside the embassy, 52 remained in captivity until the end of the crisis.

President Carter applied economic pressure by halting oil imports from Iran and freezing Iranian assets in the United States. At the same time, he began several diplomatic initiatives to free the hostages, all of which proved fruitless. On Apr. 24, 1980, the United States attempted a rescue mission that failed. After three of eight helicopters were damaged in a sandstorm, the operation was aborted; eight persons were killed during the evacuation. Secretary of State Cyrus Vance, who had opposed the action, resigned after the mission's failure.

In 1980, the death of the shah in Egypt and the invasion of Iran by Iraq (see Iran-Iraq War) made the Iranians more receptive to resolving the hostage crisis. In the United States, failure to resolve the crisis contributed to Ronald Reagan's defeat of Carter in the presidential election. After the election, with the assistance of Algerian intermediaries, successful negotiations began. On Jan. 20, 1981, the day of President Reagan's inauguration, the United States released almost $8 billion in Iranian assets and the hostages were freed after 444 days in Iranian detention; the agreement gave Iran immunity from lawsuits arising from the incident.

In 2000 former hostages and their survivors sued Iran under the 1996 Antiterrorism Act, which permits U.S. citizens to sue foreign governments in cases of state-sponsored terrorism. The following year they won the lawsuit by default when Iran did not offer a defense. The U.S. State Dept. sought dismissal of the suit, arguing it would hinder its ability to negotiate international agreements, and a federal judge dismissed the plaintiffs' suit for damages in 2002, ruling that the agreement that resulted in their release barred awarding any damages.

(1979–81) Political crisis involving Iran's detention of U.S. diplomats. Anti-American sentiment in Iran—fueled in part by close ties between the U.S. and the unpopular leader Mohammad Reza Shah Pahlavi—peaked when Pahlavi fled Iran during the 1979 Iranian revolution. When the monarch entered the U.S. for medical treatment later that year, Islamic militants stormed the U.S. embassy in Tehrān and seized 66 Americans. The hostage-takers, who enjoyed the tacit support of the new Iranian regime of Ruhollah Khomeini, demanded the shah's extradition to Iran, but Pres. Jimmy Carter refused and froze all Iranian assets in the U.S. The Iranians released 13 women and African Americans on Nov. 19–20, 1979, and another hostage was released in July 1980. A rescue attempt in April 1980 failed. Negotiations for the hostages' return began after the shah died in July 1980, but the remaining 52 hostages were kept in captivity until Jan. 20, 1981, when they were released moments after the inauguration of Ronald Reagan. The crisis contributed to Carter's failure to win reelection. Seealso Iran-Contra Affair.

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