Charles IX dies aged 24, and is succeeded as King of France by his
younger brother Henry III. Henry himself is in Poland at the time,
where he has been elected sovereign the previous year, so Catherine
de' Medici, the Queen Mother, acts as Regent until he is arrives
back in France.
Citation:
Editors. "Henry III succeeds as King of France".
The Literary Encyclopedia. First published 01 February 2011
[http://www.litencyc.com/php/stopics.php?rec=true&UID=15170, accessed 25 May 2013.]