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In 1893 , during the reign of Umberto I of Savoy as King of Italy , the collection of Leonardo da Vinci drawings was added to by a Russian collector who donated Codex on the Flight of Birds .
 Umberto I of Savoy, Leonardo da Vinci
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Umberto I of Savoy, Leonardo da Vinci