What does the Monarchy Mean?

I am wondering how the monarchy helped or hindered the people of Transylvania.

It was Queen Maria of Romania who gain Transylvania for her country and her son. King Carol lost half of it to Hungary.

Her grandson King Michael regained the land.

King Gaza of Hungary and King Andrew of Hungary invited both the German Saxons and the Teutonic Knights to Transylvania with success. Though King Andrew would send the Knights to Prussia later in his reign.

I think the Monarchy did both help and hinder the land. How about you?