The term 'Ruler with a Line?' can be answered with the word 'TSAR', which is a four-letter word. TSAR is a title used to refer to a male monarch or emperor who ruled over Russia and other Slavic lands from the 15th century until the Russian Revolution in 1917. The title was derived from the Latin word 'CAESAR' and was used to denote an autocratic ruler. Tsars were typically absolute rulers, meaning they had total control over their subjects and could make laws without consulting anyone else.