Conversation so far:
Where did Mihail Kogălniceanu grow up?
Mihail Kogălniceanu was educated at Trei Ierarhi monastery before being tutored by Gherman Vida, a monk who belonged to the Transylvanian School, and was an associate of Gheorghe Șincai.
Who was Mihail Kogălniceanu's mother?
Mihail's mother, Catinca née Stavilla, was, according to Mihail Kogălniceanu's own words, [from] a Romanian family in Bessarabia.
Where did Mihail Kogălniceanu go to school?
Mihail Kogălniceanu completed his primary education in Miroslava, where he attended the Cuénim boarding school.
Did Mihail Kogălniceanu attend any other schools?
With support from Prince Sturdza, Mihail Kogălniceanu continued his studies abroad, originally in the French city of Lunéville, and later at the University of Berlin.

Question: What did he study?
Self-contained rewrite: What did Mihail Kogălniceanu study?