duumvir

noun

du·​um·​vir du̇-ˈəm-vər 

 also  dyu̇-

1

: one of two Roman officers or magistrates constituting a board or court

2

: one of two people jointly holding power

duumvirate

d(y)u̇-ˈəm-və-rət 

noun

Word History

Etymology

Latin, from duum (genitive of duo two) + vir man

First Known Use

1600, in the meaning defined at sense 1