Old artist in collection ultimately kept by loaded magnate

• Joe of "Criminal Minds"
• "Simpsons" mob boss voice
• Italian painter and engraver noted for his frescoes (1431-1506)
• Chap with time for one note on a Renaissance painter
• Method, say, in which to obtain backing for an artist

Wikipedia Word definitions in Wikipedia
Mantegna refers to: Andrea Mantegna (Italian painter) Joe Mantegna (American actor)