Before establishing his empire, Alexander longed to survey the unknown lands further eastwards, and he led his army down the long, terrible Khybar pass to the banks of the Indus, where he fought a great battle with an Indian king called Porus, the bravest enemy he had yet met.  At last Porus was defeated and made prisoner.  He came to Alexander as if he were visiting him, and Alexander received him with like courtesy, and asked if he had any request to make.  “None, save to be treated as a king,” said Porus.  “That I shall do, for my own sake,” said Alexander, and the two became friends.  In this country of the Indus, Alexander received the submission of thirty-five cities, and founded two more, one of which he named Bucephala, in honour of his good horse Bucephalus, which died in the middle of a battle without a wound.