Question: The painter whose work appears in the Castello Sforzesco in Milan is known as the father of what? 
Sentence (from "Leonardo da Vinci"): Leonardo di ser Piero da Vinci (] ; 15 April 14522 May 1519), more commonly Leonardo da Vinci or simply Leonardo, was an Italian Renaissance polymath whose areas of interest included invention, painting, sculpting, architecture, science, music, mathematics, engineering, literature, anatomy, geology, astronomy, botany, writing, history, and cartography.
Relevant evidence: Yes