Sytry, also called Bitru, is a great prince in Johann Weyer’s Pseudomonarchia Daemonum.
The catalogue account
Section 21 uses Sytry in the Latin text. The accompanying English text prints Sitri, with Sytry supplied in an editorial note.
The entry describes a leopard’s face and griffin wings, followed by a handsome human form. It associates the spirit with arousing love and desire, and assigns sixty legions.
Source
Pseudomonarchia Daemonum, section 21, Latin and English texts in Joseph H. Peterson’s digital edition.