A machine used in mediaeval siege warfare for hurling large stones or other missiles. Sometimes called a "counterweight trebuchet" or "counterpoise trebuchet." he counterweight trebuchet appeared in both Christian and Muslim lands around the Mediterranean in the twelfth century. It could fling projectiles of up to three hundred and fifty pounds (140 kg) at high speeds into enemy fortifications.

The trebuchet did not become obsolete until the 15th century, well after the introduction of gunpowder, which appeared in Europe in second half of 13th century.