personal union

noun2

1. •
   The situation of two or more states sharing the same monarch, usually also with shared dynastic succession.

   • The United Kingdoms of Sweden and Norway, also known variously as the United Kingdoms, Sweden and Norway or Sweden–Norway, was a personal union of the separate kingdoms of Sweden and Norway under a common monarch and common foreign policy that lasted from 1814 until its peaceful dissolution in 1905.
   • Many personal unions were ended by differences in the monarchies' rules of dynastic succession, while disputes thereabout lead to dynastic wars.
2. •
   Hypostatic union; the union of Christ's humanity and divinity in one individual existence (person).