The First World War, and especially the latest one, largely swept away what was left in Europe of feudalism and of feudal landlords, especially in Poland, Hungary, and the South East generally.
It's more important to try to do something for the crores of poor people of my country.
A large wildlife book, start to finish, could take one to two years, but then I would expect to get several good (nature) magazine features off the back of this, plus of course a lot of stock.