Note: This was taken from BobFighter834 with few changes http://en.board.goodgamestudios.com/empire/showthread.php?28599-Events (thanks to the admins for giving him credit...)
The Travelling Merchant
You can buy wood, stone or coins for rubies. You can also buy a mystery box for 150 rubies, which gives various rewards such as:
4 boulders + 2 fire moat
- The researcher event allows you to research special researches during the event that is not available other times.