I once read a book where the main character was named Mattias. I believe his surname was Hand, or Han, but cannot be absolutely sure. Mattias was son of the king of the northern kingdom on the planet, and was inclined to play with Technology even though it was against the law. The kings wife (Mattias' step mother) came up with a plan to discredit Mattias and he was exiled, making her son next in line for the throne.
Mattias escapes to the island of Orleans, between the northern and southern continents, where he meets Momo (?) and starts a band. Eventually Orleans gets invaded by the southern continent and Mattias travels to their capital city where he joins a group of scientists trying to regain knowledge they've lost over the years.
The end of the book is basically when Mattias builds a radio to get in contact with a space station orbiting the planet, and they're told that there's a new spaceship from Earth approaching.
The second book (which I believe is called Corporation One, after the spaceship approaching) follows on.
I cannot remember the author nor the title. Can anyone help?