God’s father of Amun 

Here the info on the RMO site

As far as I have been able to ascertain, the name “Djedmontuefanch” that the RMO lists for the papyrus does not in fact occur on the papyrus itself, nor are any sources cited for its precise provenance. It is possible that the RMO has associated the papyrus with the splendid mummy coffin of Djedmontuefanch, which was acquired around at the same time as this papyrus 

For documentation see:
C. Leemans, 1840, Description raisonnée des monumens égyptiens du Musee d’Antiquites des Pays-Bas à Leide, pg. 249 (T.27)

Bellion, M., Égypte ancienne: catalogue des manuscrits hiéroglyphiques et hiératiques et des dessins, sur papyrus, cuir ou tissu, publiés ou signalés, Paris, 1987

Totenbuchprojekt Bonn, TM 134497