The Borgias - Season 3 Episode 6 -

When Cesare lands in northern Italy with a French army, Alexander is furious at what he sees as a challenge to his authority, but reluctantly accedes to Cesare's plan to destroy the Sforza dynasty. Catherina, meanwhile, has come up with a plot of her own: biological warfare. Concerned about the lack of funds for his Crusade, Alexander imposes punitive taxes on the newly arrived Jewish community.