Then , on 3 March 1078 , the pope excommunicated Robert and Richard and soon after Richard lay dying in Capua .
Richard began to besiege Naples , still independent , with the aid of Robert 's naval blockade .
On 3 March 1078 , the pope excommunicated Robert and Richard and soon after Richard lay dying in Capua .
Richard began to besiege Naples , still independent , with the aid of Robert 's naval blockade .