and villas for which they had been created, and his frescos in the Sistine Chapel were upstaged by those of Michelangelo. There are a few mentions of paintings and their location in sources from the decades after his death. Vasari's Life is relatively short and, especially in the first edition of 1550, rather disapproving. According to the Ettlingers "he is clearly ill at ease with Sandro and did not know how to fit him into his evolutionary scheme of the history of art running from Cimabue to Michelangelo". Nonetheless, this is the main source of information about his life, even though Vasari twice mixes him up with Francesco Botticini, another Florentine painter of the day. Vasari saw Botticelli as a firm partisan of the anti-Medici faction influenced by Savonarola, while Vasari himself relied heavily on the patronage of the returned Medicis of his own day. Vasari also saw him as an artist who had abandoned his talent in his last years, which offended his high idea of the artistic vocation. He devotes a good part of his text to rather alarming anecdotes of practical jokes by Botticelli. Vasari was born the year after Botticelli's death, but would have known many Florentines with memories of him. In 1621 a picture-buying agent of Ferdinando Gonzaga, Duke of Mantua bought him a painting said to be a Botticelli out of historical interest "as from the hand of an artist by whom Your Highness has nothing, and who was the master of Leonardo da Vinci". That mistake is perhaps understandable, as although Leonardo was only some six years younger than Botticelli, his style could seem to a Baroque judge to be a generation more advanced. The Birth of Venus was displayed in the Uffizi from 1815, but is little mentioned in travellers' accounts of the gallery over the next two decades. The Berlin gallery bought the Bardi Altarpiece in 1829, but the National Gallery, London only bought a Madonna (now regarded as by his workshop) in 1855. The English collector William Young Ottley bought Botticelli's The Mystical Nativity in Italy, bringing it to London in 1799. But when he tried to sell it in 1811, no buyer could be found. After Ottley's death, its next purchaser, William Fuller Maitland of Stansted, allowed it to be exhibited in a major art exhibition held in Manchester in 1857, the Art Treasures Exhibition, where among many other