[BenG]

I nominate Kirinyaga by Mike Resnick.
It was written as a series of short stories and novellas designed to be published as a novel later.
The book and its chapters are among the most honored in science fiction history with 67 awards and nominations including two Hugo awards.

Kirinyaga tells the story of Koriba, a well intentioned Kikuyu man from Kenya who sets about to lead his people to set up their own traditional Utopia, a planet named Kirinyaga (Mt. Kenya) after the holy mountain of their god, Ngai, in Kenya. The goal of the settlers is to live the way their ancient ancestors lived with no European influence or niceties. They will hunt and farm for their food, live off the land in traditional bomas (huts) and rule their society with the traditional councils of Elders advised by the mundumugu (wise man, witch doctor), Koriba.

Spoiler:

It is an brilliant novel about how one person's idea of utopia may not be everyone's and perhaps the ancient utopia was not a utopia at all, and how preventing change is impossible.

The story is told from Koriba's point of view, so we know that he thinks he is doing the right thing, but he is not meant to be a sympathetic character .

Goodreads:
Kirinyaga: A Fable of Utopia