text: Several reasons have been suggested for the 
  creation of the extravagant and stately palace, as 
  well as the relocation of the monarchy's seat. The 
  memoirist Saint-Simon speculated 
  that Louis 
  viewed Versailles as an isolated power centre where 
  treasonous cabals could be more readily discovered and foiled.[62] There has also been 
  speculation that the revolt of the*Fronde*caused Louis to hate Paris, which he abandoned 
  for a country retreat, but his sponsorship of many public works in Paris, such as the 
  establishment of a police force and of street-lighting,[111] lend little credence to this theory. 
  As a further example of his continued care for the capital, Louis constructed the*Hôtel des*
  *Invalides*, a military complex and home to this day for officers and soldiers rendered 
  infirm either by injury or old age. While pharmacology was still quite rudimentary in his 
  day, the*Invalides*pioneered new treatments and set new standards for hospice treatment. 
  The conclusion of the Treaty of Aix-la-Chapelle in 1668 also induced Louis to demolish 
  Paris's northern walls in 1670 and replace them with wide tree-lined boulevards.[112] 
  
  The*Cour royale*and the*Cour de*
  *marbre*at Versailles 