Of two brothers, one was rich, the other poor. The poor one had many children. One (Isaac) was taken by his uncle in exchange for a measure of corn. He brought him up. A rabbi taught him to declare his love to the cousin and placed a sword between them. The uncle consented but the aunt refused to let them marry, for she wished her brother to marry her daughter. So she gave each 100 dinars and sent them away. Both were to return after one year, and show who had been more successful. Isaac was stranded on an island where he found two kinds of herbs, one causing illness, the other healing. He cured the king and was made ruler of the town, and married his cousin on the very day when she was to be betrothed to her uncle, who had meanwhile returned after a prosperous journey.