¿quiénes le quitaron el poder a los visigodos?

Fueron de rrotados por los arabes alos que inicialmente conctacto una facction cómo mercenarios ;)

The correct answer is
1. black death

a deadly plague that swept through europe between 1347 and 1351, it killed one third of european population, but the left food supply give chances to survivors for advancement.

and

2. smallpox

an eradicated virus that used to be contagious, disfiguring, and often deadly.