The Book of Giants (Dead Sea Scroll), has long been known as a work which circulated among the Manichaeans as a composition attributed to Mani. Thus the condemnation of the "Liber de Ogia nomine gigante" as an "apocryphus" in the Decretum Gelasianum (perhaps 6th century) may presuppose a claim relating to its Manichaean origins. However, a case for its existence prior to Mani was made by the important Huguenot scholar, Isaac de Beausobre in 1734 (vol. 1 of his Histoire critique de Manichèe et du Manicheìsme, p. 429 n. 6, cited by W. B. Henning in "The Book of the Giants", BSOAS 11 [1943-1946] p. 52). De Beausobre inferred that Mani must have drawn upon at least two Mauvais sources: a "Book of Enoch" and a further writing which the 9th-century chronographer Georgius Syncellus had de-scribed as "T] ypacpri xcòv yiyavxcov". The latter work was, in turn, said to have been discovered after the flood by a certain Katvav (Noah's great-grandson according to LXX Gen. 10:24).