Botticelli, who lived from the 1440s to 1510, is one of the most celebrated painters of the early Renaissance period, but only about a dozen examples of his work survive today.
Botticelli was forgotten for centuries after his death, but his work was rediscovered in the 19th Century, and the artist has since become one of the biggest names in art history.
Yeah, John, I gotta wonder what art history expert they hired.
Just browsing through my image files on Botticelli I found the following:
Primavera
Birth of Venus
Venus & Mars
Madonna of the Magnificat
Madonna with Pomegranate
Madonna & Child with Two Angels
Mystic Nativity
Portrait of Guliano de Medici
Portrait of a Young Woman
Portrait of a Young Man
Portrait of Dante
Portrait of Simonetta Vespucci
Pallas & the Centaur
A Young Woman recieving Gifts from Venus & 3 Graces (fresco)
Virgin & St. Matthew with Angels
Calumny of Apelles
Madonna of the Book
St. Sebatian
Annunciation
Portrait of a Man with a Medal of Cosimo the Elder
Youth of Moses (Sistine Chapel)
Madonna & Child
The Story of Nastagio Degli Onesti (from Boccaccio's Decammeron)
Punishment of the Sons of Korah
The Virgin & Child Enthroned
The Last Communion of St. Jerome
The San Marco Altarpiece
The Divine Comedy (an illuminated manuscript of Dante's epic poem illustrated with 92 paintings by Botticelli)
Madonna & Child with Angel (Spedale degli Innocenti)
Madonna & Child with John the Baptist
The Story of Virginia
The Sant' Ambrogio Altarpiece
Discovery of the Body of Holofernes
Madonna in Glory with Seaphim
Agony in the Garden
Madonna of the Rose Garden
San Barbara Altarpiece
Portrait of a Lady (Smeralda Bandinelli)
Baptism of St. Zenobius
A Young Man Being Introduced to the Seven Liberal Arts
Madonna & Child with 3 Angels
The Las Miracle and the Death of St. Zenobius
Three Miracles of St. Zenobius
Lamentation over the Dead Christ
Portrait of a Young Man (London)
Portrait of a Young Man with a Red Cap
Portrait of Michele Marullo
Portrait of a Young Woman (Simonetta Vespucci?, Tokyo)
La Bella Simonetta
Portrait of Lorenzo Di Ser Lorenzi
Judith Leaving the Tent with the Head of Holofernes
Judith with the Head of Holofernes
Madonna & Child (Cardiff)
Saint Augustine
Adoration of the Magi
And there are undoubtedly more. I didn't bother to count, but it looks like quite a few more than a dozen.
As for Botticelli's reputation, until the 19th century and the development of Art History, the history of art seems to have been a lot like that of pop music today. The majority of the stars of one era were immediately forgotten and replaced by the stars of the next generation. Rembrandt, Velazquez, El Greco, Dürer, Van der Weyden, Giotto, Veronese, Vermeer, Bosch, and a great many other artists saw a decline in reputation for years prior to the development of studies in Art History and the establishment of public Art Museums.
Beyond Vasari, there were few attempts as any real studies of art history. Botticelli certainly wasn't completely forgotten. His paintings could be found in the collections of important figures such as the Medici, the Gonzagas, and the Popes on the walls of the Sistine. Botticelli worked with Pietro Perugino in the Sistine. Perugino was Raphael's teacher and there are certainly elements suggestive of Botticelli's influence in Raphael's paintings... especially his Madonnas. Botticelli became a major influence again upon William Blake, the Pre-Raphaelites and the artists of the Arts & Crafts and Aesthetic movements. He would be written about by Walter Pater and his influence can be seen in Alphonse Mucha and other artists of the Art Nouveau.