युद्ध के हाथियों से होने वाले हमलों के दौरान सुरक्षा के लिए गोलकोंडा किले के दरवाजों पर किस विशेषता का उपयोग किया गया था?

Who built the Shahi (Royal) road during his rule, which was later renovated and renamed the Grand Trunk Road by the British?

In which year was the Bahmani Sultanate established?

The 'Alai Darwaza', the entrance gate of Qutub Minar, was constructed during whose reign?