He was much esteemed by Pope Sixtus V, and in 1589 was sent as papal Ambassador to the court of Francesco Maria della Rovere, the last Duke of Urbino, who held him in high regard.

In a letter of 1596 Albergati told the duke Francesco Maria della Rovere that he had asked Cardinal Francisco Toledo for permission to read Jean Bodin (whose works were on the Index of forbidden books).

After substantially enlarging his original manuscript Albergati eventually decided to publish it, first in Rome (1602) and then in Venice (1603), under the title: Dei discorsi politici libri cinque.

Canini Marchio;” and on the reverse, falling dew, with the legend “Divisa beatum.” Fabio Albergati is best known as an opponent of the French political philosopher Jean Bodin.

[5] He elaborated the idea of a kinship, a participation in a similar 'unorthodoxy', between Jean Bodin and Niccolò Machiavelli and equated the philosophy of raison d'état with Machiavellianism.

Furthermore, in the writing of Albergati, the difficulty of defining the point of equilibrium in the tension between morals and politics, can be found in those passages in which the author confirms the possibility of the prince's carrying out certain dissimilatory practices (La republica regia, pp.