Where would the circus be? Within the city or (more likely) outside the walls?

I know that the eastern side of the city is theoretically the least troublesome, but there is virtually no defense (apart from destroying the bridges) from that side, if some enemy decides to circle around the city and then go through the bridges... maybe they should be removable or there should be a tower or something like that...

Havard, I like your interpretation of things. Tonisborg was originally in the same location as Vestfold, so you could make it a ruin nearby or even put the ruins of Tonisborg under Vestfold. Or making the Barleycorn Island village built upon the ruins of Tonisborg would work, too. I am ok with however you want to do it.