Conversation so far:
What was Mihail Kogălniceanu's connection to the reforms?
Mihail Kogălniceanu's efforts at land reform resulted in a censure vote.
What happened to Mihail Kogălniceanu during the times of the  reforms?
Mihail Kogălniceanu's efforts at land reform led Cuza to enforce them through a coup d'état in May 1864.
What else is significant about the events involving the reform?
Mihail Kogălniceanu resigned in 1865, following his own conflicts with the monarch due to the situation brought about by the reform.

Question: What did he do for the Prince?
Self-contained rewrite: What did Mihail Kogălniceanu do for Prince Mihail Sturdza?