1) Ancient Greek government 2) Ancient Greek title 3) Greek boy name 4) Ruler 5) Swayer 
Basileus (βασιλεύς (Byzantine and Modern Greek pronunciation), plural βασιλεῖς, basileis) is a Greek term and title that has signified various types of monarchs in history. Its meaning is perhaps best known in English as `King` or `Emperor`. Best known use of the title is by the Byzantine emperors, but also has a longer histor...
king.
(from the article `archon`) Next came the polemarch, commander in war and judge in litigation involving foreigners. Third, the kingship survived in the basileus, who, as chief ... ...arranged the trials that took place before the courts, with each functionary having a specific jurisdiction: the archon over matters pertaining to ... W...
Emperor.
[n] - a ruler of the eastern Roman Empire
noun a ruler of the eastern Roman Empire