Ibn Khurdadhbih, an official in the postal service wrote one of the first travel books and the form remained a popular one in Arabic literature with books by ibn Hawqal, ibn Fadlan, al-Istakhri, al-Muqaddasi, al-Idrisi and most famously the travels of ibn Battutah. These give a view of the many cultures of the wider Islamic world and also offer Muslim perspectives on the non-Muslim peoples on the edges of the empire. They also indicated just how great a trading power the Muslim peoples had become. These were often sprawling accounts that included details of both geography and history.