Giorgio Vasari, Lives of the most Eminent Painters Sculptors and Architects…
“ These commissions given, Michelagnolo desired that Tribolo should make two nude statues, which were to be one on either side of that of Duke Giuliano, which he himself had already made; one was to be a figure of Earth crowned with cypress, weeping with bowed head and with the arms outstretched, and lamenting the death of Duke Giuliano, and the other a figure of Heaven with the arms uplifted, all smiling and joyful, and showing her gladness at the adornment and splendour that the soul and spirit of that lord conferred upon her. ”
