The Duke's type of woman
The books fetched from the Lady's office are more about history than customs, but there are some about folk beliefs. I only find brief descriptions of the nobles' society. It seems it didn't change much through the years, by the way.
The Empire has undergone actual revolutions in matters of nobiliary titles and social structures. On the other side, Kyre has stayed the same for centuries. It must be due to the continuous attacks from the north. Barbarian tribes have been trying to pass through many times, but the Lord of Kyre's troops stopped them almost every time.
The last decades have been more peaceful. Kyre used those years to expand and fertilise the farming lands. The craftsmanship followed the overall development, eventually surpassing the technological improvements of agriculture.
All this information is quite helpful to understand my new home. I'll be able to help Alexander when the time comes. However, I was looking for social rules and customs!