such a king...

From the Life of Alexander...

"Now, however, he marched out against Dareius, expecting to fight another battle; but when he heard that Dareius had been seized by Bessus, he sent his Thessalians home, after distributing among them a largess of two thousand talents over and above their pay. In consequence of the pursuit of Dareius, which was long and arduous (for in eleven days he rode thirty-three hundred furlongs), most of his horsemen gave out, and chiefly for lack of water. At this point some Macedonians met him who were carrying water from the river in skins upon their mules. And when they beheld Alexander, it being now midday, in a wretched plight from thirst, they quickly filled a helmet and brought it to him. To his enquiry for whom they were carrying the water, they replied: "For our own sons; but if thou livest, we can get other sons, even if we lose these." On hearing this he took the helmet into his hands, but when he looked around and saw the horsemen about him all stretching out their heads and gazing at the water, he handed it back without drinking any, but with praises for the men who had brought it; "For," said he, "if I should drink of it alone, these horsemen of mine will be out of heart." But they beheld his self-control and loftiness of spirit, and began to goad their horses on, declaring that they would not regard themselves as weary, or thirsty, or as mortals at all, so long as they had such a king."