On EUW (Not sure about other regions), the champion rotation is different : r/leagueoflegends
Surrender at 20: October 2016
League of Legends free to play champion rotation
League of Legends in Greece - Free champion rotation 1 http://eune .leagueoflegends.com/en/news/champions-skins/free-rotation/new-free-champion -rotation-2014-preseason-week-1 | Facebook
Lets enjoy lol life with this blog….. | Page 2
Surrender at 20: Free Champion Rotation, Week of February 16th
Surrender at 20: Free Champion Rotation, Week of February 27th
League of Legends Weekly Free Champion Rotation - Dot Esports
Surrender at 20: May 2013
League of Legends free to play champion rotation
Surrender at 20: Free Champion Rotation, Week of May 18th
League of Legends free to play champion rotation
Surrender at 20: Free Champion Rotation, Week of December 17th
League of Legends Weekly Free Champion Rotation - Dot Esports
SA Legacy - Tomorrow new champion rotation and new... | Facebook
Surrender at 20: 2020
Surrender at 20: December 2015
EUW/EUNE/RU Clash test starts September 30 - LoL News