Although Apponius’ Expositio in Canticum Canticorum refers directly to one of the books of the Old Testament, by dint of the allegorical exegesis used by it’s author, we can find there many New Testament subjects and theological problems. It also contains knowledge about the Holy Trinity. In the article there were used quotations about the Holy Trinity (from books I-III), one can find either the very noun “Trinity” (Trinitas) or individual Persons in the Holy Trinity: the Father, the Son and the Spirit, yet having relations with each other. In the first part of the article there were analyzed attributes, which are used by Apponius to describe the nature of the Holy Trinity: inseparabilis, individua, coaeterna Trinitas. The specified attribu...