The Evil Eye
The Evil Eye was an object of dread, and penalties concerning it are conspicuous in the old Brehon laws. The Suil Bhaloirs, or Balor eye, relates to one Balor, who was able by an eye to strike a foe dead. Love potions, on the contrary, are referred to in many ancient songs.
Persons were put under vows to do or not to do a thing. They were said to be under Gesa. This was often imposed with certain spells or charms.