The short version: I have a number of issues with this book, but I recommend it nonetheless.
Reston's overarching theme is quite muddled. There was an apocalypse? But there wasn't? Oh the pagan armies of monstrous foes were baring down on Christianity? Oh, it was the clash of personalities over a period of decades? Huh? Ah, OK, the Christians beat out the pagans, so it was like an apocalypse for the pagans or an apocalypse in the 12th century sense of the triumph of 'good' over evil. I guess...The entire thing is an unclear stretch. There was no united pagan host seeking to wipe out Christianity or battle for religious supremacy, as is hinted at on the book's inside cover, and really, in this respect Reston is just expanding on the "jihads" of Mansor in Spain and the Viking raids (which were actually seen as apocalyptic hundreds of years before 1000 AD). The Christian front was far more organized, it being one religion versus dozens, and really the decades around 1000 AD were much worse for pagans than Christians, but, of course, even the Christian kingdoms spent most of their time fighting and trying to one-up each other and there was no United Nations of Christianity at the time.
Honestly, calendar dates aside, the coming of the Mongols in the 13th century and The Black Death in the 14th were far more apocalyptic than Viking raiders, cultured Arabs and 2nd rate barbarian horsemen.
Reston's contemporary world asides are lame; he builds the Magyars up to be something on par with the Mongols, then slowly and unintentionally reveals they were kind of boring losers by comparison (no offence Hungarians); he often just directly copies or paraphrases primary sources with limited interesting opinion or innovative thought; he includes no citations which means his sources and opinions should be taken with an extra grain of salt -- especially since some of his claims are disputed by historians (eg Jomsvikings even existing); and he rambles on about Christianity and inserts his own thoughts into the minds of historical figures, such as Gerbert and Otto preparing for the apocalypse (maybe -- again, he's not very clear when it comes to his theme).
I am very critical of historical works, given I studied history extensively in college. So here's why you should still pick this up and read it if you love history, particularly Medieval, Viking, Moorish, Holy Roman or Byzantine history:
The biographies, mini-histories, tales and primary sources presented are all wonderful, and Reston has, overall, assembled a fascinating grouping of them which keep the reader thoroughly entertained, and which paint a brilliant portrait of the European world in the centuries around 1000 AD. Ignore the half-baked theme and structure and digest the wonderful, beautiful history instead.
True Rating: 3.7 Stars