Fezzan, along with the northern regions of Tripolitania and Cryenania, merged under Italian rule in 1912. After shifting powers, the United Kingdom of Libya was formed in 1951, which maintained the 3 provinces. Though the provinces became obsolete when Libya turned into a unitary state in 1963.
"Fezzan". Encyclopedia Britannica. Encyclopedia Britannica. Web. 2016. https://www.britannica.com/place/Fezzan