He was at first rejected but successfully sued against that decision before the Apostolic Signatura in Rome, and was instated as canon of St Thomas' Church in 1300.
[3] He died on 26 September 1313 and is buried in the church, where his ornate Gothic ledger stone is preserved to this day.
That monument depicts him in clerical attire and holding a book; the inscription says (the letters in brackets are missing): ANNO D[OMI]NI MCCCXIII VI KA[LENDAS] OCTOBR[IS] O[BIIT] MAG[ISTE]R GOZ[ZO] DE HAGENOWE MEDICUS CANONICUS S[ANCTI] THOME ARG[EN]T[INENSIS].
[3] Gottfried is the author of an epic poem (4,134 rimed verses in Latin) on the life and the feasts of Mary, the Liber [book] sex festorum beatae Virginis (1293–1300), (also known as Carmen [song] sex festorum Beatae Mariae Virginis), dedicated to bishop Conrad of Lichtenberg.
[3] The poem is preserved through manuscript copies made in 1861 by Charles Schmidt (1812−1895) [fr], and earlier by Jérémie-Jacques Oberlin, and Eberhard Gottlieb Graff; those copies are kept in the National and University Library, and have been edited by the German scholar Volker Schupp [de].