There is a timber a hallow is made out of, by some bemused by its uselessness, yet Vitruvius already pointed out the advantage of this timber being that it doesn’t rot. Indeed, a city was built upon this timber, similar to Venice, in which in ancient times a noble hostage was held - re-abducted, if you want. She was impregnated by a leader of a people who caused a global player a tremendous loss. This leader had a brother who worked for the global player. What was (presumably) the brother‘s haircolour?
Disclosure: A part of this riddle has been published in a local newspaper, I expanded it and adapted it for an English audience. The title doesn’t give any hints, it‘s just that this riddle reminded me on the show (S4E1 because it needs 15 characters, apparently
I am a fan of Harry Potter, especially the later books.