Marcabru, the last representative of the first generation of troubadours had a very complex personality. The short study wishes to prove the real closeness of the poem Pax in nomine Domini as for poetical atmosphere to Christian doctrine. To go beyond strereotypes, the study shows slight differences between meanings of biblical texts and common traditions. All this reflection is a part of greater research which tends to reveal and prove a supposition on an important relationship between courtly and mystical poetry.