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sub-ruler
sub-ruler n.
Brit. 
/ˈsʌbˌruːlə/
, /ˈsʌbˌruːlə/U.S. /ˈsəbˌrulər/
/ˈsəbˌrulər/ΚΠ
1673 R. Baxter Let. in Answer to Mr. Dodwell 82 Doth it follow that your Church Monarch can..rule them without any sub-rulers?
1861 Daily News 5 Oct. 5/4 These mudirs..are..taken into the service of the Turkish government as sub-rulers over districts.
2003 Derby Evening Tel. (Nexis) 20 Feb. 10 Athelfaeda..was sub-ruler of Mercia.
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