He became specially notorious because of a curious controversy that arose concerning the amulets which Eybeschiitz was suspected of issuing.
These amulets recognized the Messianic claims of Sabbatai Sebi, and a famous rabbinic contemporary of Eybeschiitz, Jacob Emden, boldly accused him of heresy.
How strongly his mind revolted against the use of charms, amulets, incantations and such devices appears from his writings; and he has expressly recorded, as underlying all his practice, the conviction that, however diseases may be regarded from the religious point of view, they must all be scientifically treated as subject to natural laws (De acre, 29).
The present Palazzo Comunale, a Renaissance edifice, contains a fine museum, chiefly remarkable for the contents of prehistoric tombs found in the district (including good bronze fibulae, necklaces, amulets, &c., often decorated with amber), and a large collection of acorn-shaped lead missiles (glandes) used by slingers, belonging to the time of the siege of Asculum during the Social War (89 B.C.).
Some curious memorials of the superstition have survived in rings and amulets, engraven with the various signs, and worn as a kind of astral defensive armour.