From Cosmo are descended Lorenzo the Magnificent, the Duc de Nemours, the Duc d’Urbino, father of Catherine, Pope Leo X., Pope Clement VII., and Alessandro, not Duke of Florence, as historians call him, but Duke della citta di Penna, a title given by Pope Clement VII., as a half-way station to that of Grand-duke of Tuscany.

From Lorenzo are descended the Florentine Brutus Lorenzino, who killed Alessandro, Cosmo, the first grand-duke, and all the sovereigns of Tuscany till 1737, at which period the house became extinct.

But neither of the two branches—­the branch Cosmo and the branch Lorenzo—­reigned through their direct and legitimate lines until the close of the sixteenth century, when the grand-dukes of Tuscany began to succeed each other peacefully.  Alessandro de’ Medici, he to whom the title of Duke della citta di Penna was given, was the son of the Duke d’Urbino, Catherine’s father, by a Moorish slave.  For this reason Lorenzino claimed a double right to kill Alessandro,—­as a usurper in his house, as well as an oppressor of the city.  Some historians believe that Alessandro was the son of Clement VII.  The fact that led to the recognition of this bastard as chief of the republic and head of the house of the Medici was his marriage with Margaret of Austria, natural daughter of Charles V.

Francesco de’ Medici, husband of Bianca Capello, accepted as his son a child of poor parents bought by the celebrated Venetian; and, strange to say, Ferdinando, on succeeding Francesco, maintained the substituted child in all his rights.  That child, called Antonio de’ Medici, was considered during four reigns as belonging to the family; he won the affection of everybody, rendered important services to the family, and died universally regretted.

Nearly all the first Medici had natural children, whose careers were invariably brilliant.  For instance, the Cardinal Giulio de’ Medici, afterwards Pope under the name of Clement VII., was the illegitimate son of Giuliano I. Cardinal Ippolito de’ Medici was also a bastard, and came very near being Pope and the head of the family.

Lorenzo II., the father of Catherine, married in 1518, for his second wife, Madeleine de la Tour de Boulogne, in Auvergne, and died April 25, 1519, a few days after his wife, who died in giving birth to Catherine.  Catherine was therefore orphaned of father and mother as soon as she drew breath.  Hence the strange adventures of her childhood, mixed up as they were with the bloody efforts of the Florentines, then seeking to recover their liberty from the Medici.  The latter, desirous of continuing to reign in Florence, behaved with such circumspection that Lorenzo, Catherine’s father, had taken the name of Duke d’Urbino.

At Lorenzo’s death, the head of the house of the Medici was Pope Leo X., who sent the illegitimate son of Giuliano, Giulio de’ Medici, then cardinal, to govern Florence.  Leo X. was great-uncle to Catherine, and this Cardinal Giulio, afterward Clement VII., was her uncle by the left hand.