What reforms were carried out in Russia in the 16th century? How was state administration organized?

IX century – the reign of Ivan the Terrible.
Reforms:
1. Establishment of a single unit of tax collection;
2. Creation of the Code of Law (there was a strengthening of the central government);
3. Military reform (creation of a permanent rifle army);
4. Stoglavy Cathedral (reflection of changes associated with the centralization of power);
5. Cancellation of “feedings”;
The king was the head of the state. The Boyar Duma helped him, but a new organ also appeared – the Zemsky Sobor. The first orders appeared.