 In the 10th century military treatise "On Skirmishing" explicit mention is made of "Expilatores", a Latin word which meant "robber" or "plunderer" but which is used to define a type of mounted scout or light raider.Also mentioned in descriptions of army- or thematic-level light cavalry are "trapezites", "those whom the Armenians call "tasinarioi"", who "should be sent out constantly to charge down on the lands of the enemy, cause harm and ravage them.