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Qiraah Sab'ah or 7 Qiraat / recitation was introduced by Ibn Mujahid (a well known authority of Qur'an in Baghdad in 322 A.H), in which he referred to the 7 types of qiraat popularised by 7 imams of qiraat.. ie

Qalun dan Warsy, narrated (the recitation) from Imam Nafi’ (in Madinah)
Qambul dan Al-Bazzi, narrated (the recitation) from Ibnu Katsir (in Makkah)
Ad-Duri dan Susi, narrated (the recitation) from Imam Abu Amr (in Basrah)
Syukbah dan Hafas, narrated (the recitation) from Imam Asim (in Kufah)
Kholafi dan Khollad, narrated (the recitation) from Imam Hamzah (in Kufah)
Hisyam dan Dzakwan, narrated (the recitation) from Imam Ibnu Amir (in Syam)
Abdul Haris dan Duri , narrated (the recitation) from Imam Ali Kisa’i (in Kufah)

wallaahu a'lam