)He also waged war untiringly on the supporters of the Shabbethaian heresies, which he regarded as dangerous to the best interests of Judaism, and in this connection wrote his "Esh Dat" (London, 1715) against Hayyun (who supported Shabbetai Zevi).Nieto was one of the most accomplished Jews of his time and was equally distinguished as philosopher, physician, poet, mathematician, astronomer, and theologian.