Amrendra

Once upon a time there was a kingdom that mostly followed the southern traditions and culture but differed from the others for two main things: it was blessed with four seasons - instead of three, led by monsoon rains - and with twin royals, so there were always two interchangeable kings...
Rohit always thought he should be content with his "almost twin", his cousin Ajay. Bun one day he discovers he had an actual twin, Rahul... 
Harish grew up in an itinerant circus before discovering he is actuall the twin prince of Amrendra.
The story of the twin royalty of Amrendra. A novella of the southern kingdoms of Silvery Earth.