Stop Press! It's reached the best selling spot in Amazon.com "Ancient Historical Fiction" - see image below.
"I noticed a medieval painting of several magi surrounding the infant Christ. I was surprised there were so many. Soon after that, by coincidence, I read an article about how the idea there were “Three Kings” had probably emerged because of the three symbolic gifts - gold, frankincense and myrrh. Whereas, in the early church, it was assumed several wise men attended the nativity.
The idea of who the other kings might be led to this story of a young teenage boy's rite of passage as he follows his grandfather, The Fourth King, to the nativity.
It's ended up as a short novel aimed at kids - "aged nine to ninety."