After overthrowing King Idris 1969, he became virtual president of a republic, although he nominally gave up all except an ideological role 1974. He favours territorial expansion in N. Africa reaching as far as Zaire. He has supported rebels in Chad, and has proposed mergers with a number of countries. His theories, based on those of the Chinese communist leader Mao Zedong, are contained in a 'Green Book'.