Cover art
de Camp, L. Sprague. Lest Darkness Fall. Ballantine/Del Rey 1983.
Cover art
de Camp, L. Sprague. Lest Darkness Fall. Translated to the French as De peur que les ténègbres…, NEO 1983.

De Camp, L. Sprague. Lest Darkness Fall
Divergence: 527 CE
Summary: Mysteriously transported to Rome in the time of Justinian, a modern man decides to start up a few modern industries and avert the Dark Ages.
Published: Ballantine 1949, 1974 (0345241398BUY), 1983 (0345310160BUY); Pyramid 1963; Easton 1988; SFBC 1996.
— Revision of "Lest Darkness Fall" in Unknown, December 1939.
— Included in Lest Darkness Fall & To Bring the Light (w/ David Drake), Baen 1996 (0671877364BUY); and Years in the Making: The Time-Travel Stories of L. Sprague de Camp (ed. Mark L. Olson), NESFA 2005 (1886778477BUY).
Original in: English.
Translation: Nederlands by Riet Neehus-Aalderink as Een Fakkel voor het Keizerrijk, Gradivus 1978 (9063177712).
Translation: French by Christian Meistermann as De peur que les ténègbres…, Marabout 1972, NEO 1983 (2730401954), Les Belles Lettres 1999 (2251771298).
Translation: Italian by Gianni Atom as L'abisso del passato, Ponzoni 1959.
Translation: Italian by Renato Prinzhofer as Abisso del passato, Nord 1972 (8842903019), Mondadori 1999.
Translation: Polish by Radoslaw Januszewski as Jankes w Rzymie, Alfa 1991 (8370014488).
Translation: Portuguese by Eurico Fonseca as A Luz e as Trevas, Livros do Brasil 1987.
Translation: Spanish by Domingo Santos as El tiempo no es tan simple, J.J. Fernández Ribes 1976 (8436508475).
Translation: Swedish by Christina Fagerström as Om mörkret faller, Optima 1983 (9176480062).

Stirling, S.M. "The Apotheosis of Martin Padway"
Summary: Time travelers go back to c. 570 to see the Great Man who helped restore the Western Roman Empire.
Series note: Sequel to L. Sprage de Camp's Lest Darkness Fall.
Published: In The Enchanter Completed (ed. Harry Turtledove), Baen 2005 (0743499042BUY); and Ice, Iron and Gold, Night Shade 2007 (1597801151BUY).