Which renaissance writer also worked as an adviser, or courtier, to royalty?

Baldassare Castiglione

During the period Baldassare was a Renaissance writer and adviser to the royalty.
Moreover, the Renaissance era started in the 14th century and lasted up to the 17th century. It did have a great impact on politics, government and social organization during that time. As a cultural reform, Renaissance did impact education and was the basis for widespread educational reforms. Renaissance did play an important part in politics as well by developing the conventions of diplomacy. This period also saw the resurgence of artistic works. By way of art Renaissance impacted governments and social organizations and changed the way of their working and thinking.