Beetween 63and 120 the romans kills 2 millions jewsout of a population of 3 millions before(1,1 in revolt of 63-70; 500 000 in the kotios war; 400 000 in bar kojva revolt) And after these big masacres most of them were exiled, unless a tiny comunity of no more than 50 or 100 thousand. And during the cristian roman empire they were again atacked. The worst was some years before the arab invasion when the byzantine emperor after dreaming that a circumsed would overtrown his empire decide to exterminate all his jews, mostly in Israel. And he nearly arrives to, if it was not thanks to the arab conquest. After his masacres most of the israeli jewish comunty fly to egypt. It was a very tiny comunity of some hundreds that were still in Israel. And is weel known that they keep their culture but no arabized more than normal sefaradic jews. So no palestinan is from jewish ancestry.