Conquest by Dhamma is the best conquest.
सब्बे भूता सुखिता होन्तु। (सर्वे भूताः सुखिनो भवन्तु)

Politicians
Ashoka
Third Mauryan emperor (r. c.268-232 BC), first to unify most of India. After Kalinga's carnage in 260 BC he turned to Buddhism and declared rule by Dhamma. His rock edicts are among the world's oldest texts on tolerance.
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Source: アショーカ王 第13岩石勅令 (Major Rock Edict 13、紀元前256年頃)Verified