The earliest text which preserves fragments of George's narrative is in a Greek hagiography which is identified by Hippolyte Delehaye of the scholarly Bollandists to be a palimpsest of the 5th century.[7] An earlier work by Eusebius, Church history, written in the 4th century, contributed to the legend but did not name George or provide significant detail.[8] The work of the Bollandists Daniel Papebroch, Jean Bolland, and Godfrey Henschen in the 17th century was one of the first pieces of scholarly research to establish the saint's historicity, via their publications in Bibliotheca Hagiographica Graeca.[9] Pope Gelasius I stated in 494 that George was among those saints "whose names are justly reverenced among men, but whose actions are known only to God."[10]