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Contributory factors included his early separation from his mother for boarding school followed by his mother 's early death ; the death of his close friend and colleague Nikolai Rubinstein ; and the collapse of the one enduring relationship of his adult life , his 13-year association with the wealthy widow Nadezhda von Meck , who was his patron even though they never actually met each other .
 person: Nikolai Rubinstein; person: Nadezhda von Meck
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 person: Nikolai Rubinstein; person: Nadezhda von Meck