Sentence:  Because he filched away/ Thine own bright flower, the glory of plastic fire,/ And gifted mortals with it, — such a sin/ It doth behoove he expiate to the gods,/ Learning to accept the <WSD>empery</WSD> of Zeus,/ And leave off his old trick of loving man. 
Meaning of the word marked with <WSD> tags:  Absolute power or authority.