In 1897 Warburg married, against his father's will, the painter and sculptor Mary Hertz, daughter of Adolph Ferdinand Hertz, a Hamburg senator and member of the Synod of the Evangelical-Lutheran Church in Hamburg, and Maria Gossler, both members of the traditional Hanseatic elite of Hamburg.
The couple had three children: Marietta (1899–1973), Max Adolph (1902–1974) and Frede C. Warburg (1904–2004).
In 1898 Warburg and his wife took up residence in Florence.
While Warburg was repeatedly plagued by depression, the couple enjoyed a lively social life.
Among their Florentine circle could be counted the sculptor Adolf von Hildebrand, the writer Isolde Kurz, the English architect and antiquary Herbert Horne, the Dutch Germanist André Jolles and his wife Mathilde Wolff-Mönckeberg, and the Belgian art historian Jacques Mesnil.
The most famous Renaissance specialist of the time, the American Bernard Berenson, was likewise in Florence at this period.
Warburg, for his part, renounced all sentimental aestheticism, and in his writings criticised a vulgarised idealisation of an individualism that had been imputed to the Renaissance in the work of Jacob Burckhardt.

During his years in Florence Warburg investigated the living conditions and business transactions of Renaissance artists and their patrons as well as, more specifically, the economic situation in the Florence of the early Renaissance and the problems of the transition from the Middle Ages to the early Renaissance.
A further product of his Florentine period was his series of lectures on Leonardo da Vinci, held in 1899 at the Kunsthalle in Hamburg.
In his lectures he discussed Leonardo's study of medieval bestiaries as well as his engagement with the classical theory of proportion of Vitruvius.
He also occupied himself with Botticelli's engagement with the Ancients evident in the representation of the clothing of figures.
Feminine clothing takes on a symbolic meaning in Warburg's famous essay, inspired by discussions with Jolles, on the nymphs and the figure of the Virgin in Domenico Ghirlandaio’s fresco in Santa Maria Novella in Florence.
The contrast evident in the painting between the constricting dress of the matrons and the lightly dressed, quick-footed figure on the far right serves as an illustration of the virulent discussion around 1900 concerning the liberation of female clothing from the standards of propriety imposed by a reactionary bourgeoisie.
In 1897 Warburg married, against his father's will, the painter and sculptor Mary Hertz, daughter of Adolph Ferdinand Hertz, a Hamburg senator and member of the Synod of the Evangelical-Lutheran Church in Hamburg, and Maria Gossler, both members of the traditional Hanseatic elite of Hamburg. The couple had three children: Marietta (1899–1973), Max Adolph (1902–1974) and Frede C. Warburg (1904–2004). In 1898 Warburg and his wife took up residence in Florence. While Warburg was repeatedly plagued by depression, the couple enjoyed a lively social life. Among their Florentine circle could be counted the sculptor Adolf von Hildebrand, the writer Isolde Kurz, the English architect and antiquary Herbert Horne, the Dutch Germanist André Jolles and his wife Mathilde Wolff-Mönckeberg, and the Belgian art historian Jacques Mesnil. The most famous Renaissance specialist of the time, the American Bernard Berenson, was likewise in Florence at this period. Warburg, for his part, renounced all sentimental aestheticism, and in his writings criticised a vulgarised idealisation of an individualism that had been imputed to the Renaissance in the work of Jacob Burckhardt.
During his years in Florence Warburg investigated the living conditions and business transactions of Renaissance artists and their patrons as well as, more specifically, the economic situation in the Florence of the early Renaissance and the problems of the transition from the Middle Ages to the early Renaissance. A further product of his Florentine period was his series of lectures on Leonardo da Vinci, held in 1899 at the Kunsthalle in Hamburg. In his lectures he discussed Leonardo's study of medieval bestiaries as well as his engagement with the classical theory of proportion of Vitruvius. He also occupied himself with Botticelli's engagement with the Ancients evident in the representation of the clothing of figures. Feminine clothing takes on a symbolic meaning in Warburg's famous essay, inspired by discussions with Jolles, on the nymphs and the figure of the Virgin in Domenico Ghirlandaio’s fresco in Santa Maria Novella in Florence. The contrast evident in the painting between the constricting dress of the matrons and the lightly dressed, quick-footed figure on the far right serves as an illustration of the virulent discussion around 1900 concerning the liberation of female clothing from the standards of propriety imposed by a reactionary bourgeoisie.
Aby Warburg