Sentence:  Admit no other way to ſaue his life / [...] that you, his Siſter, / Finding your ſelfe deſir'd of such a perſon, / Whoſe creadit with the Iudge, or owne great place, / Could fetch your Brother from the <WSD>Manacles</WSD> / Of the all-building-Law: and that there were / No earthly meane to ſaue him, but that either / You muſt lay downe the treaſures of your body, / To this ſuppoſed, or elſe to let him ſuffer: / What would you doe? 
Meaning of the word marked with <WSD> tags:  A fetter, a restriction.