Belial

Belial was one of the Crowned Princes of Hell that was almost summoned by the Constance Ball using a spell from the Necronomicon. Each time he was summoned, a member of the Campbell family stopped the Salem Witches from raising him. The first was Nathaniel Campbell who described him as a Half Man-Half Goat-looking demon. The second being Dean Winchester who saw it take the form of his long dead father: John Winchester. He was sent back to hell shortly afterwards using a reverse spell from the Necronomicon.