Emperor Asoka's Kalinga War and subsequent conversion to Buddhism had a profound impact on the propagation of peace in ancient India. [1] After witnessing the extensive death and suffering caused by his Kalinga War in 260 BCE, Asoka was deeply affected and renounced violence. [2] He converted to Buddhism and adopted Buddhist principles of nonviolence, tolerance and compassion. [3] Asoka worked to spread Buddhism across India and other parts of Asia by building monuments, sending missionaries and making Buddhism the state religion.