Brandy. Sorcery. Accounting Systems. Copper Tubing. Printing Press. Reporters. Clock. Telegraph. Crossbow. Gunpowder. Politics.
Lest Darkness Fall by David Drake is an early example of alternative history science fiction. This classic first appeared as a short story in 1939 and was first published as a novel in 1941. The story is still amusing and enjoyable to read.
Briefly, a present day — late 1930’s — archeologist is struck by lightening and sent back to 6th century Rome. There he introduces some modern inventions. But, his ultimate goal is to prevent the coming of the Dark Ages. One of his biggest obstacles is the politics of the era. Some things never change.
The novel was well worth the time I spent reading it.