This is a seal from the book "Lesser Key of Solomon". According this text, the spirit Ronove, is described thus
"The Twenty-seventh Spirit is Ronove.
He appeareth in the Form of a Monster. He teacheth
the Art of Rhetoric very well and giveth Good Servants,
Knowledge of Tongues, and Favours with Friends or
Foes. He is a Marquis and Great Earl; and there be
under his command 19 Legions of Spirits. His Seal is