LeopoldPhilippe
Banned
Duke of Cornwall makes sense. But perhaps after Henry Tudor took the throne, the tradition could be changed to Prince of York and Lancaster.
When, in January 1486, Henry VII married Elizabeth of York, daughter of Edward IV, the red and white roses of Lancaster and York merged into the Tudor rose, a symbol of reconciliation and new beginnings.
Likewise for the heir to the throne, the title of Prince of York and Lancaster is a merging of the House of York and the House of Lancaster.