Updated to 1.37.2
Also added a WIP tree for West Roman restoration. Do not choose that path though because it is bugged and incomplete.

Added a new mission, "Rise of the Sforzas", which enables a privilege for the Secret Council estate, granting monthly militarized society and reduction of army tradition decay, while increasing global unrest.
Also, the "Sforzesque Monarchy" reform now gives you a fixed dynasty.

Added a new Estate, the Secret Council requiring the "Sforzesque Monarchy" Government Reform.
This means you will come in contact with the estate once you appoint Sforza as the Duke.
Historically, the Duchy of Milan employed the Secret Council to discuss matter of war, justice, and foreign policy; it was made up by around 20 members, including the Duke himself.
The Secret Council is a powerful estate that allows you to obtain some great bonuses, but with each of them you will also increase the unrest in your nation, so choose carefully.
Additionally, the Sforzesque Monarchy reform no longer gives nobility loyalty equilibrium, but Secret Council loyalty equilibrium.