Sentence:  ... he ("the said Pope") doth not onely claime to be spirituall head of all Christians, but also to haue an "Imperiall Ciuill" power ouer all Kings and Emperours, <WSD>dethroning</WSD> and decrowning princes with his foote, as pleaseth him ... 
Meaning of the word marked with <WSD> tags:  To depose; to forcibly relieve a monarch of the monarchy.