Part 2: History of the tarot deck
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Kaplan, Stuart and Jean Huets. The Encyclopedia of Tarot Volume IV, p. 669. Stamford: U.S. Games Systems, Inc, 2005.
Summary
1442: Illustrated trionfi (trump) cards were added to decks of playing card. The symbols and characters on these trump cards were based on the Renaissance notion of a hierarchy of triumphs. The trump cards would evolve into the modern Major Arcana, which is the defining characteristic of a tarot deck.