threatened by extinction in England; are still spoken by people in France; have been revived in some parts of the British Isles; have an extensive body of literature.
A political system in which nobles are granted the use of lands that legally belong to their king, in exchange for their loyalty, military service, and protection of the people who live on the land.
The formula, brought to China in the 400s or 500s, was first used to make fumigators to keep away insect pests and evil spirits. In later centuries it was used to make explosives and grenades and to propel cannonballs, shot, and bullets.