Question

Why is Zurbaran sometimes called the "Spanish Caravaggio"?

Answer 1

Zurbaran was sometimes called the "Spanish Caravaggio''  because although it was unclear whether he copied the man's works directly, although his use of chiaroscuro takes a similarly realistic approach. 

Answer 2

He is most famous for his paintings of nuns and monks. he was such a good painter that he was nicknamed "spainsh caravaggio"