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    Ludovico Sforza, Patron of Leonardo da Vinci  
Ludovico Sforza was Duke of Milan from 1489 until his death. A member of the Sforza family, he was the fourth son of Francesco Sforza. He was famed as a patron of Leonardo da Vinci and other artists, and presided over the final and most pro...
 
    George Biddell Airy, English Astronomer Royal  
Sir George Biddell Airy was an English mathematician and astronomer, Astronomer Royal from 1835 to 1881. His many achievements include work on planetary orbits, measuring the mean density of the Earth, a method of solution of two-dimensiona...
 
       
 
         
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