Cry of the Banshee (1970)

Storyline:

In Elizabethan England, a wicked lord massacres nearly all the members of a coven of witches, earning the enmity of their leader, Oona. Oona calls up a magical servant, a "banshee", to destroy the lord's family. (The "banshee" of this tale bears no resemblance to the normal usage of the term!)