Sources such as diaries though not very reliable can be used if there are a large amount of them showing the same date and event. Historical books written about the event especially those closer to the time would be able to help determine that the date is accurate as well.
Meditation would be the correct answer ;)
Answer:
it was meant to end the Romanovs have a nice day <<3
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However, feudalism decline mainly begun when feudal lords were allowed to pay armies rather than fight themselves in the battles. More also, the black death made labor scarce and worthy commodity, at the same time when the peasants migrated to urban areas. Emergence of new towns, and trade opportunities also entrenched the kings powers and made the government centralized. other factors included the crusades and the age of exploration.