Leonardo da Vinci and Michelangelo were both great artists of the Renaissance period. They were also bitter rivals. Why were these men threatened by each other's talent? a. One artist was a sculptor while the other was a painter. b. They were born in different cities--loyalty to a city fueled their rivalry. c. They both needed patronage from the same people--the Medici and the Pope. d. One man created secular art while the other was strictly a religious artist.