echos of the past series/order of the series

Hi I just played echos of the past house of stone. I see there are more Echos of the past games.
Question what it the order to play then in? 1 thru 5 I think there is that many now.

To play in order:

1. Royal House of Stone
2. Castle of Shadows
3. Citadels of Time
4. Revenge of the Witch
5. Kingdom of Despair

Enjoy!