Alexander’s campaigns resulted in a network of Greek kingdoms on the north-west frontier of India. The road across Asia Minor lay open, and what intercourse there must have been in that old world, so full of splendour and magnificence, so noisy with armies and kings, can be guessed from the fact that the faces which look out at us from Byzantine mosaics have their double in the frescoes of east central Asia, and the casket enshrining Buddha’s bones in the Peshawar temple was made by a Greek artist.