The Libellus de exordio atque procursu istius, hoc est Dunhelmensis, ecclesie (English: Tract on the Origins and Progress of this the Church of Durham), in short Libellus de exordio, is a historical work of marked literary character composed and compiled in the early 12th-century and traditionally attributed to Symeon of Durham. It relates the history of bishopric and church of Durham and its predecessors at Lindisfarne and Chester-le-Street (Cunecacestre). It is sometimes also known as the Historia Dunelmensis ecclesiae (English: History of the Church of Durham).