Within These Walls
The Guilds of The City are part nation state, part political faction and part race. The Guilds a jealous and long ago attuned their most precious objects and secret spaces to members of the guild. Each guild has a specialty, but members perform all sorts of roles. There are merchants in the Farmers Guild and vice versa.
Inter-Guild marriages are common, but mostly occur in the lower classes. Children of such a marriage are often Guildless. Those fortunate enough to avoid that fate will inherit the guild of only one of their parents.