NoDictionaries   Text notes for  
... illo prognatus manu consanguineorum necaretur magnisque mox Italiae cladibus...

Imperf. subj. substituting for fut. pass. inf. in o.o. after "fore ut"; so also "vindicaretur": "it would happen that a descendant...would be killed and (his killing) avenged afterwards with great disasters for Italy."