Caerus, Blue Jewel of Sayal.
>Is it independent, or part of a larger kingdom?
It is the capital of the Kingdom of Sayal.
>What are its relations with the rest of kingdom (or its immediate neighbors) like?
It can be thought of as a sort of analogue for Constantinople, with a bit of Mecca thrown in. It has a commanding position on sea trade routes and hosts a number of temples key to an old, fading religion.
>How old is the city?
Utterly ancient. It's a millennial city, with all the twisting undercrofts and catacombs that implies.
>How many ethnicities are present?
Several, all drawn from surrounding lands. Pilgrims to the blue-halled temples have always been common, and in this day and age, tourists have come from the other side of the world to visit the same places.
>How is it run?
Trade goes in, trade goes out. While land and air transport are starting to take over in the modern era, the sea still represents the most effective means of shipping goods, and Caerus has forever expanded its ports to accommodate larger freighters. The city government is also the kingdom's, with the king being both master of the capital and master of the realm.
>What are some of it's major and/or most interesting laws?
A curious law has stood for centuries regulating the display of the color blue. Originally, this was a matter of controlling the supply of Sayal's famous blue pigment, but these days is more a city beautification measure. Only government and religious centers can display the color.
>How does it keep order?
Through the usual methods: royal guards for the palace, police officers for the common streets.
>Is it known for any specific food?
Blueberries, of course.
>What are it's major exports/imports?
Caerus has always been famous for its export of pigments, chief among them Sayal Blue, made from grinding up local lapis lazuli, and for its stones, with turquoise and sapphires both finding their way out of the city's old workshops in stunning jewelry.