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Juan Carlos I of Spain. (Not exactly the same, but he could have had absolute power and chose to give that up) https://en.m.wikipedia.org/wiki/Spanish_transiti

• justboxing 9y ago
  > Prince Juan Carlos initially remained in the background during public appearances and seemed ready to follow in Franco's footsteps. Once in power as King of Spain, however, he facilitated the development of a "constitutional monarchy". Doesn't sound like he gave it up, just re-branded it to keep with the times. Like my father used to say "Death alone can remove them."