The void was filled by the Dark Ages. After the fall of the Western Roman Empire, there were barbarians that were threateing all around Europe and who did not wish for the progression of society and humanity. They only cared about pillaging and looting - hence the name dark ages.
The way that the Great schism of 1378 to 1417 (which also known as the western Schism) impact the Roman Catholic church is :
it called into question the credibility of the papal lineage after it was split into two different camps for a time
hope this helps
No because there is no evidence that the site has been found