Thrown into the past, an American familiar with the works of the historian Procopius, establishes an Italo-gothic kingdom, and with the recruitment of the great General Belisarius to his cause, seems to prevent the full depths of the "Dark Ages". This book is a classic of the Alternative History Genre. though the book originally appeared in 1941, i enjoyed the 1963 edition. ( )

This is the ebook published by Arc Manor (http://www.phoenixpick.com) which includes some related short stories written by others. Effectively it's A Connecticut Yankee in the Court of King Arthur but written as time travel science fiction. Stylistically, it's very much of it's day, so female characters are walk-on only and are limited to the tart with a heart, the girl next door and Lady Macbeth.

Basically, the hero (an archaologist) is struck by a bolt of lightning by The Pantheon in 1936 and transported back in time to around 530 AD. Here he introduces various modern inventions - distillation, double-entry bookkeeping and Arabic numerals, the printing press and the semaphore telegraph - to the Gothic kingdom, defeats Belisarius, and generally keeps the Roman Empire from collapse thereby turning the story from time travel to alternate history.

In some ways I found this story to be more believable than 1632 in that the hero is not very heroic, but less believable in that he had the technical knowledge to create a working printing press and just happened to know double entry bookkeeping. I'll grant distillation, spyglasses and Arabic numerals and the germ theory...

Lest Darkness Fall is an alternate history science fiction novel written in 1939 by author L. Sprague de Camp. The book is often considered one of the best examples of the alternate history genre; it is certainly one of the most influential. The novel reminded me of Mark Twain's A Connecticut Yankee in King Arthur's Court. In it American archaeologist Martin Padway is visiting the Pantheon in Rome in 1938. When a thunderstorm arrives lightning cracks and he finds himself transported to 6th century Rome.
Padway arrives in an Italy ruled by the Ostrogoths, a tribe who recently overthrew the Western Roman Empire, but ruled with benevolence, allowing freedom of religion, and maintaining the urban Roman society they had conquered.
The Gothic War of the mid-sixth century saw the Eastern Roman Empire overthrow the Ostrogoths and the Vandals in north Africa, but they never consolidated their rule over Italy, and it collapsed into smaller states with further invasions by the Lombards. The great cities of Rome were abandoned as Italy fell into a long period of decline. Some historians consider this as the true beginning of the Dark Ages.
Padway initially wonders if he is dreaming or delusional. he quickly accepts his fate and sets out to survive. His first idea is to make a copper still and sell brandy for a living. He convinces a banker, Thomasus the Syrian, to lend him Seed money to start his endeavor. He also begins teaching his clerks Arabic numerals and double entry bookkeeping. He eventually develops a printing press, issues newspapers, and builds a sketchy semaphore telegraph system. His attempts to develop a mechanical clock, gunpowder, and a cannon are failures. He gradually becomes more and more involved in the politics of the state, as Italy is invaded by the Imperials and also threatened from the south and east. This leads Padway to engage with the army in its campaigns and the results have the potential for unexpected changes in the direction of history. The novel is an entertaining read, but it did not impress this reader as worthy of all of the accolades it has received. ( )