Hell's Foundations Quiver

Centuries ago, the human race fought its first great war against an alien race—and lost. A tiny population of human beings fled to distant Safehold. Centuries later, their descendants have forgotten their history; for them, life has been an eternal Middle Ages, ruled by the Church of God Awaiting, whose secret purpose is to prevent the reemergence of industrial civilization.
But not all of Safehold's founders were on board with this plan. Those dissidents left behind their own secret legacies. One of those is Merlyn Athrawes, cybernetic avatar of one of Earth's longdead defenders, now reawakened after a thousand years to restart human…