A lot has been written about this troubled Prince, to almost Hamletesque proportions, that I don't feel the need to repeat here.
Heraldically, he brought in the Laborde de Monpezat family Coat of Arms which his second son, Prince Joachim, carries on his 'Dynastic Inescutcheon' and which will presumably be carried on by his children in turn. Also, Her Majesty granted the title Count/Countess of Monpezat to all her mail-line descendants in his honour in 2008.
May he now rest in peace.