In the English language the title "Prince Regent" is most commonly associated with George IV, who held the style "HRH" The Prince Regent during the incapacity, by dint of mental illness, of his father, George III (see Regent for other regents). Regent's Park, Regent Street and Regent's Canal (which he commissioned) in London, were all named in honour of him. The architect John Nash, under the patronage of HRH The Prince Regent, planned a palatial summer residence for the prince, 50 detached villas in a parkland setting and elegant terraces around the exterior of the park. This was all part of an ambitious plan, to develop The Regent's Park and lay out an elegant new street, Regent's Street, to link it to St James's Park and the prince's London residence, Carlton House. Regent Terrace in Edinburgh is also named after the Prince Regent, who visited the area in 1822.