A sultan is an Islamic monarch. Sultan is usually used by monarchs of Arabic, Turkish or Malaysian ethnicity as opposed to Khan or Shah. In modern English, the term is gradually being replaced by king. The sultan's domain is properly called a sultanate. The feminine form is sultana.
... in the periodical Ruskii Vestnik ("Russian Messenger"), but Tolstoy clashed with the editor, Mikhail Katkov, over issues that arose in the final installment. ...