Delzimmer lacks a formal ruler or much authority. What it has instead are four well-established human families who operate storage warehouse, moneylending/changing/banking services, and caravan outfitting concerns. (These are not costers. They prefer to let other individuals go to the discomfort and danger of actual caravan travel.) Their private armies of liveried guards police the streets in a rough-and-ready manner -- and interestingly, although the four families are rivals, they seem to have long ago come to some firm pacts to prevent their clashing interests (and the swords of their guards) from ever erupting into open strife. In short, they share the wealth that flows to them by maintaining Delzimmer as an open trading city.
These local satraps (I employ the collective southern term for petty rulers because these de facto rulers of Delzimmer entirely lack any formal titles or authority) are the families:
Belark, whose guards wear leather armor of crimson hue to which are affixed painted metal bucklers displaying a black hawk in flight winging to the sinister on a white sky device;
Harlhaun, whose guards and retainers wear blue-green (deep blue dominating) livery or armor adorned with bucklers emblazoned with a purple upright sword on a white field;
Jathlet, whose colors is a light lime green and whose badge is a blue-black panther or hunting cat that is depicted leaping upward toward the sinister (on a white field);
and Olaundran, whose colors are gold trimmed with white (aye, cloth-of-gold or shimmerweave, not yellow of any hue), and whose device is a circle of six gold coins (each of which is decorated in black with a single staring eye, which has won them the name "watchcoins") on a scarlet field.