<P> Qutab Ud - Din - Aibak , founder of the Delhi Sultanate , started construction of the Qutub Minar 's first storey around 1192 . In 1220 , Aibak 's successor and son - in - law Iltutmish completed a further three storeys . In 1369 , a lightning strike destroyed the top storey . Firoz Shah Tughlaq replaced the damaged storey , and added one more . </P>
who caused to build qutub minar in delhi
Qutab Ud - Din - Aibak Aibak 's successor and son - in - law Iltutmish Firoz Shah Tughlaq