Alexander found many rich treasures in Gaza. He sent a large part of them to his mother Olympias, whom he had left in Macedon. Alexander's affection for his mother seems to have been more permanent than almost any other good trait in his character. He found, in addition to other stores of valuable merchandise, a large quantity of frankincense and myrrh. These are gums which were brought from Arabia, and were very costly. They were used chiefly in making offerings and in burning incense to the gods.