Sentence:  Though kept by "Rome'''s and "Mahomet'''s chiefe powers; / They should not long detain him there in thrall: / We would rake "Europe" rather, <WSD>plain</WSD> the "East"; / Dispeople the whole "Earth" before the doome: 
Meaning of the word marked with <WSD> tags:  To level; to raze; to make plain or even on the surface.