Counterweight Trebuchet

Timeline

1. 1161–1170Levant and eastern Anatolia · LevantAgainst the backdrop of the Ayyubid rise and Crusader state contraction in the 1160s, sieges were frequent in the Middle East; large counterweight or hybrid trebuchets used by Byzantine and Islamic engineers demonstrated effective destructive power against stone walls. Arabic historical records and later technical history research hold that by this period the counterweight principle had moved beyond purely manpower traction.
2. 1165–1170Mediterranean (Crusader-European contacts) · MediterraneanExchanges in the late 1160s among Crusader nobles, Genoese and Venetian merchants, and Byzantine technicians laid the groundwork for the counterweight trebuchet principle to reach Italy and France; although large-scale European adoption mostly appears in the early 13th century, historical clues of technical understanding and experimental deployment appear by the end of this decade.