Hello,
I made a small timeline with some of the main Linux distributions and the origins of Mageia: RedHat/Mandrake (+Conectiva) Mandriva, and distributions derived from Mandrake-Mandriva (and PCLinuxOS). There is news that the Caixa Mágica (from Portugal - text in english) which was derived from Mandriva, is changing to be a derivative of Ubuntu.
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Note-1: I edited this timeline in Freemind.
Note-2: link to the same topic in MageiaBrasil, in Portuguese