For decades scholars of early Christianity have awaited a reconstruction of Tyconius’ Expositio Apocalypseos (Exposition of the Apocalypse). Tyconius wrote it about 380 AD, but it did not survive in its entirety. Two fragments of it were found in Budapest and Turin, but they were incomplete and one shows evidence of interpolation. However, so many early medieval commentators on John’s Apocalypse made use of it, that patristic scholars believed that a fairly complete reconstruction was possible. Roger Gryson did just that in Vol. 107A of Corpus Christianorum Series Latina (Turnhout: Brepols, 2011)
[Update] My full review of Gryson’s edition is now available. Please see this article entitled, Tyconius’ Exposition of the Apocalypse: A Reconstructed Edition.