Question: The painter whose work appears in the Castello Sforzesco in Milan is known as the father of what? 
Sentence (from "Sala delle Asse"): The Sala delle Asse (In English: 'room of the tower' or 'room of the wooden boards'), is the location for a wall and ceiling painting in tempera on plaster, of decorated "intertwining plants with fruits and monochromes of roots and rocks", by Leonardo da Vinci, dating from about 1498 and located in the Castello Sforzesco in Milan.
Relevant evidence: Yes