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When did Pablo Picasso begin signing his artworks simply Picasso?

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Pablo Picasso began signing his artworks simply as "Picasso" in late 1901.12

Earlier in his career, the artist used different signatures as he transitioned away from his father's surname, Ruiz. As a youth, he was known as Pablo Ruiz and signed his earliest paintings "P. Ruiz". By the turn of the 20th century, he began using "P.R. Picasso" for his paintings and drawings before eventually settling on the single-name signature.21