For the Grand Duke Ferdinand I. of Florence, Rubens painted several pictures, among them a "Hercules between Venus and Minerva." In Spain he executed a series called "The Labors of Hercules," besides three separate ones, representing the slaying of the dragon, the struggle with Antæus, and the combat with a lion. He also copied the celebrated cartoon of Leonardo da Vinci, called "The Battle of the Standard," and made a valuable portrait of himself for the Grand Ducal collection of self-painted heads of artists. At Genoa he made drawings of her remarkable palaces and churches, which he published later in a volume with one hundred and thirty-nine illustrations. After an absence of eight years in Italy, Rubens was recalled to Antwerp by the illness of his mother. He started homeward October 28, 1608, with a heavy heart. On his way he learned that she had died nine days before he began his long journey. On reaching Antwerp, he shut himself up for four months in the Abbey of St. Michael's, where she had been buried. He had given her no ordinary affection, and his was no ordinary loss. He met this loss in the silence of his own thoughts in the abbey, and when he had gained the self-control necessary for his work, he came out into the world. Most of us learn to bear our sorrows in our own hearts, without laying our burdens upon others, finding, sooner or later, that the world has enough of its own. He talked of returning to Italy, but Archduke Albert and Isabella, proud of his genius and his attainments, invited him to court, sat for their portraits, and made him their official painter. One of his first works for them was a "Holy Family," which was so much admired that the Society of St. Ildefonso of Brussels, Archduke Albert being its head, ordered an altar-piece for the Chapel of the order of St. James. "This picture," says Dr. Waagen, "which is at present in the Imperial gallery at Vienna, represents the Virgin Mary enthroned, and putting the cloak of the order on the shoulders of St. Ildefonso. She is surrounded by four female saints. On the interior of the wings are the portraits of Albert and Isabella, with their patron saints. This work, one of the most admirable ever painted by Rubens, displays in a remarkable degree the qualities praised in the one painted for the Archduke." The association were so pleased that they offered the artist a purse of gold, which, having been made a member, he would not receive, saying that his only desire was to be useful to his brother members.