The demon Zepar appears in the grimoires The Discoverie of Witchcraft, Pseudomonarchia Daemonum, and The Lesser Key of Solomon
From The Lesser Key of Solomon, Crowley/Mathers edition:
The Sixteenth Spirit is Zepar. He is a Great Duke, and appeareth in Red Apparel and Armour, like a Soldier. His office is to cause Women to love Men, and to bring them together in love. He also maketh them barren. He governeth 26 Legions of Inferior Spirits, and his Seal is this, which he obeyeth when he seeth it.