2 examples of co-regent in sentences

But Maria Theresa, first joining her husband, Duke Francis of Lorraine, in her sovereignty, but without prejudice to it, under the title of co-regent, took an attitude truly heroic.

The King of Saxony has resigned, or rather he has associated his nephew with himself as Co-Regent; the brother waiving his claim to the throne.

2 examples of  co-regent  in sentences