customs she did not know. In the end, she decided to move to Castile, while retaining the possibility of moving back to the Netherlands in case she could not adjust to the Castilian customs. Charles, Eleanor, and Mary sailed from Ghent on 15 September 1556. Although she repeatedly assured her brother that she had no intention of occupying herself with the affairs of state, Mary offered to become adviser to her niece Joan, who was serving as regent for Philip. Joan did not wish to share power and declined her aunt's offer.Piret, 167. Mary did not enjoy her retirement for long; Eleanor died in her arms in February 1558. The grief-stricken queen travelled to Charles to ask him for advice about her future. Charles told her that he wanted her to resume regency in the Netherlands, and promised a home and a large income, but Mary declined the offer. Her nephew Philip then urged her advisor to convince her to return. When Charles became ill in August, Mary accepted the offer and decided that she would become governor once again. In September, Mary was fully prepared to depart for the Netherlands and resume her post when she was informed of Charles's death. Distressed by the death of another sibling, the Queen, who had suffered from a heart disease most of her life, had two heart attacks in October. Both were so severe that her doctors thought that she had died.Piret, 168. When Joan visited her, Mary was still determined to fulfill the promise she had given to Charles and assume the regency in the Netherlands, but she was weak and feverish. She died only few weeks later, in Cigales on 18 October 1558. In her last will, Mary left all her possessions to Charles. Since Charles had died, Philip inherited his aunt's property. Shortly before her death, she decided that Philip and Joan should execute her will. She requested that her heart-shaped gold medallion, once worn by her husband, be melted down and the gold distributed to the poor. Queen Mary was first buried in the Monastery of Saint Benedict in Valladolid. Fifteen years after her death, Philip ordered that the remains be transferred to El Escorial. Patronage of arts Mary was a keen art collector, and owned several important masterpieces of Early Netherlandish painting as well as more contemporary works. These included the Deposition of Christ by Rogier van