The paper deals with the text of hitherto unknown epitaph written to honour Duke Henry of Glogów (died in 1309). Henry was a prominent figure, participated in the rivalry for the unification of Polish lands; also he ruled in Great Poland (1306-1309) and aspired to win the royal crown. The text of the epitaph was preserved in copies (originating from the beginning of the 17th century, from around 1700) in the collections of inscriptions of the Cistercian monastery in Lubiaz (Leubus). Thus, it is very likely that the poem was written in this monastery. The study of versification (regular hexameter in elaborated leonines) indicates that the poem was written in the first half of the 14th century. Also the analysis of the contents shows that the author must have written it shortly after the death of the duke, around 1315 (the text mentioned briefly the destruction of Poznan that had taken place in 1313/1314). When compared with other epitaphs of that time, the poem is distinct, not only because of its extent, but also its artistic qualities and original subject matter.