WHICH RULER BUILT HOW MANY FLOORS IN QURUB MINAR

Qutubuddin Aibak built the base (first floor) of Qutub Minar in 1192 AD.
Iltutmish extended three storeys in Qutub Minar in 1220 AD.
Its top floor was destroyed by lightning at Qutub Minar.
Ferozeshah Tughlaq rebuilt the destroyed floor and at the same time raised a new floor in Qutub Minar. Sher Shah Suri built an entrance in the Qutub Minar during his reign.
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