Many histories from the classical period of Islamic civilization dealing with the early conquests have futūḥ in their title and are considered to form their own genre of literature, called futūḥ reports. Like many other histories from the early period, the futūḥ reports contain a mixture of genres and material, with some clearly of an administrative, religio-legal, philosophical, or edificatory nature. For example, a common feature of the genre is an account of the opposing ambassador's first impression of the Arab army in which he remarks favorably upon the primitive virtues of these early Muslim warriors, thus implicitly criticizing the luxury and over-refinement of the author's own time.