She could not bring herself to visit him very often, due to his erratic behaviour and occasional violent reactions. It is believed she did not visit him again after June 1812. However, Charlotte remained supportive of her spouse as his illness, now believed to be porphyria, worsened in old age. While her son, the Prince Regent, wielded the royal power, she was her spouse's legal guardian from 1811 until her death in 1818. Due to the extent of the King's illness he was incapable of knowing or understanding that she had died.