Hausa language The Hausa of northern Nigeria, Niger and Chad have been shaped more by Islam than by Western influences. Northern Nigerian written literature can be divided into 4 main periods. The first is the 14 Kingdoms Period (10th-19th century), the second is the Sokoto period (19th-20th century), the third is the Colonial Period (20th century), and the fourth is the Post-Independence period (20th century to present). The Fourteen Kingdoms This period had many authors who produced books that dealt with theology, history, biography, mathematics, language, writing, documentaries, geography, astronomy, diplomacy and poetry. Some of the known authors and some of their works Ibn Furtu was the Chronicler of Mai Idris Alooma. He produced two historical works: The Book of the Bornu Wars, and The Book of the Kanem Wars, which detail the wars that transformed Bornu from an independent Sultanate into an Empire. These works were produced in 1576 and 1578 respectively. Muhammad abd al-Razzaq al-Fallati was a 16th-century Fulbe scholar in Hausaland who wrote K.fi'l-tawhid Uthman Ibn Idris of Borno sent a letter to the Mamluk Sultan of Egypt in 1391-1392. The letter was one of a diplomatic nature, it also contained poetry and an erudite understanding of Islamic law. This letter contains the earliest extant indigenous written poem produced in Nigeria. Muhammad al-Maghili wrote On The Obligations of Princes in Kano for Muhammad Rumfa in the 15th century. Al-Maghili was a Berber from North Africa who was born in an area that is now Algeria. Muhammad ibn al-Sabbagh was a 17th-century scholar and author from Katsina, Northern Nigeria. He was celebrated during and well after his time, and wrote praise poetry for the Sultan of Borno's conquest against the Jukun people. He also wrote a poem praising the Sultan of Katsina Muhammad Uban Yari. Muhammad ibn Masani was the student of Muhammad ibn al Sabbagh and also a celebrated scholar from Katsina. He also produced works in the Hausa language during the 17th century. He wrote many works, one of them was an anthropological study on the Yoruba people, this work was mentioned by Muhammad Bello who lived some 200 years later in his Infaq'l-Maysuur Azhar al-ruba fi akhbar Yuruba. It was one of the earliest written accounts on the transatlantic slave trade by an indigenous African, which also noted that free Muslim people were taken from all parts of Hausaland and sold to European Christians. He