The main town in a shire, where the government offices are.
Shiretowns are important because they have the government offices.
Examples:
The shiretown is where the mayor works.
We went to the shiretown to get a license.
The shiretown is far away from our village.
The shiretown is where all the big decisions are made.
The shiretown is the heart of the shire.
The shiretown is where the king lives.