Sounds a bit like Malaysia, where the “The Yang di-Pertuan Agong [the constitutional monarch] is elected by the Conference of Rulers, comprising the nine rulers of the Malay states, with the office de facto rotated between them, making Malaysia one of the world’s few elective monarchies.”

https://en.m.wikipedia.org/wiki/Yang_di-Pertuan_Agong

(1) use regularly: instagram, unfortunately

(2) stopped using: Reddit