Foundation (novel series)
The Foundation series is a science fiction novel series written by American author Isaac Asimov. First published as a series of short stories and novellas in 1942–1950, and subsequently in three novels in 1951–1953, for nearly thirty years the series was widely known as The Foundation Trilogy: Foundation (1951), Foundation and Empire (1952), and Second Foundation (1953).
Source: Wikipedia — Foundation (novel series) (CC BY-SA 4.0)