खमेर राजा (सूर्यवर्मन प्रथम) ने किस भारतीय राजा के साथ मित्रता स्थापित की थी?

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?