Sovereign (noun)

1. A supreme ruler, especially a monarch.
2. A person who has supreme power or authority.
3. A former British gold coin.

Origin:

Middle english soverain, from old french souverain, from latin superānus, from super above.

Examples:

1. Queen Elizabeth is the sovereign of the United Kingdom.
2. The sovereign has the final say in matters of state.
3. A sovereign was worth one pound.
4. The sovereign of the kingdom issued the decree.
5. In ancient times, a sovereign was often thought of as ruling by divine right.