suzerains

/S UW0 Z EH1 R EY1 N Z/
noun
  1. 1

    A dominant nation or state that has control over the international affairs of a subservient state which otherwise has domestic autonomy.

  2. 2

    A feudal landowner to whom vassals were forced to pledge allegiance.

Source: https://en.wiktionary.org/wiki/suzerain, https://en.wiktionary.org/wiki/suzerains