Niels Hildeson is the Tidemaster of the River Temma, the river that runs through the city and named her. Aside from running the harbor and the adjoined market, insurance house and goods exchange, he is also the head of the Guild of Mercers, the oldest and most powerful guild in the city.
They say you can't find a more unpleasant man in all of Temma, and it does seem that he delights in making enemies and being rude. However, he is perhaps the sharpest person in the city, with almost clairvoyant understanding of human nature. It is said he can feel the tides of humanity, ebbing and flowing through the city streets and allies, and learn about his enemies' plays before they complete them.