The shell bone script of character Monarch is
The top is a hand holding a scepter, character Administer - 尹 (Post 344). The bottom is Mouth. A person holding a scepter (has power) speak out to give orders, who is a monarch, such as King, Emperor, etc.
The bronze script of the character is
The top is Administer - 君，the bottom is Mouth.
The big seal script of the character is
Its Pinyin is Jun1.
君 was used as Monarch originally, but gradually, it has been used for decent gentlemen too. Normally, it follows a person's family name, e.g. 王君, a gentleman whose family name is 王 (He is not King, or any monarch).