Question: In what year did Michelangelo create "Taddeo Tondo"?
About the article "Michelangelo", section "Madonna and Child".

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Madonna and Child.
The "Madonna of the Steps" is Michelangelo's earliest known work.
It is carved in shallow relief, a technique often employed by the master-sculptor of the early 15th-century, Donatello and others such as Desiderio da Settignano.
While the Madonna is in profile, the easiest aspect for a shallow relief, the child displays a twisting motion that was to become characteristic of Michelangelo's work.
The "Taddeo Tondo" of 1502, shows the Christ Child frightened by a Bullfinch, a symbol of the Crucifixion.
The lively form of the child was later adapted by Raphael in the "Bridgewater Madonna".
The "Bruges Madonna" was, at the time of its creation, unlike other such statues which show the Virgin proudly presenting her son.
Here, the Christ Child, restrained by his mother's clasping hand, is about to step off into the world.
The "Doni Tondo", depicting the Holy Family, has elements of all three previous works: the frieze of figures in the background has the appearance of a low-relief, while the circular shape and dynamic forms echo the Taddeo Tondo.
The twisting motion present in the Bruges Madonna is accentuated in the painting.
The painting heralds the forms, movement and colour that Michelangelo was to employ on the ceiling of the Sistine Chapel.
Pitti Tondo is a marble bas-relief of the Virgin and Child by Michelangelo.
It was produced between 1503 and 1504 and is now in the Museo nazionale del Bargello in Florence. 
Kingdom of Tondo.
The former region of Tondo is over eleven hundred years old.
Historically, Tondo already existed in the year 900 AD according to the Laguna Copperplate Inscription, a legal document written in Kawi now housed in the National Museum of the Philippines.
According to this document, Tondo was ruled by person called Jayadeva who holds the Sanskrit title Senapati or "admiral".
Tondo was ruled by a line of Lakan until the Spanish conquest. 
The most prized possession of the Academy’s collection is Michelangelo's "Taddei Tondo", left to the Academy by Sir George Beaumont.
The Tondo is on display in a purpose-built area on the Sackler Wing gallery level.
Carved in Florence in 1504–06, it is the only marble by Michelangelo in the United Kingdom and represents the Virgin Mary and Child with the infant St John the Baptist. 
The Taddei Tondo (or The Virgin and Child with the Infant St John) is a circular relief sculpture by the Italian Renaissance artist Michelangelo Buonarroti.
It is located in the Royal Academy of Arts in Piccadilly, central London, England.
It is the only marble sculpture by Michelangelo in the United Kingdom.
The sculpture was carved by Michelangelo in Florence, Italy, in 1504–06 and represents a seated Virgin Mary with the baby Jesus who is sprawled across her lap and looking back over his right shoulder towards the infant St John the Baptist who is standing over him and offering him a bird.
Taddei Tondo is the greatest treasure in the Royal Academy’s collection.
It was bought by Sir George Beaumont during a visit to Italy in 1821 and it was left to the Academy in 1830.
The Tondo is on display in a purpose-built area on the Sackler Wing level of the Royal Academy.