Sentence:  [H]e through the midſt unmarkt, / In ſhew Plebeian Angel militant / Of loweſt order, paſt; and from the dore / Of that <WSD>"Plutonian</WSD>" Hall, inviſible / Aſcended his high Throne, [...] 
Meaning of the word marked with <WSD> tags:  Of or relating to Pluto, the Greek and Roman god of the underworld; demonic, infernal.