'Ruler' in the Bible

and certain of them said, 'By Beelzeboul, ruler of the demons, he doth cast forth the demons;'

for, as thou art going away with thy opponent to the ruler, in the way give diligence to be released from him, lest he may drag thee unto the judge, and the judge may deliver thee to the officer, and the officer may cast thee into prison;

And a certain ruler questioned him, saying, 'Good teacher, what having done -- shall I inherit life age-during?'