Prince regent

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.

Subject to certain limitations for a period, the prince regent was able to exercise the full powers of the King.

Prinzregententorte is a multi-layered cake with chocolate butter cream named in Luitpold's honour.

The heir-apparent or heir-presumptive to the grand duke of Luxembourg may be titled prince-lieutenant ('prince deputy') during a period in which the incumbent remains formally on the grand ducal throne, but (progressively, most) functions of the crown are performed by the 'monarch apprentice', as prince Jean did 4 May 1961 – 12 November 1964 in the last years of his mother Charlotte's reign until she abdicated and he succeeded to the grand ducal throne (she lived until 1985), and Jean's own son prince Henri 3 March 1998 – 7 October 2000 until his father abdicated and he succeeded (Jean lived until 2019).