Of these Three: Who is Transylvanian "Royalty?"

I've added three pictures, and I am sure you know these people by name, but only one of them had the title, "prince of Transylvania"  can you guess who?

The person ruled for one year between 1599-1600 the three principalities of Moldova, Wallachia and Transylvania.

This person was killed in 1600.

Still can't guess?

His name was Michael the Brave.