From which Duchy does King Charles receive a large proportion of his income?

King Charles receives a large proportion of his income from the Duchy of Cornwall, which is specifically established to provide income for the heir apparent to the British throne. The Duchy of Cornwall generates revenue through various means such as land, property, and agriculture, and it is significant for providing financial support for the Prince of Wales and his initiatives.

The Duchy of Lancaster, while also providing income for the monarchy, is more associated with the reigning monarch rather than the heir. It offers the monarch a private income sourced from its assets, which include land and property. The other duchies mentioned, such as York and Edinburgh, do not hold the same level of relevance in the financial structure for the royal family or do not pertain to King Charles in terms of his primary income sources.

Overall, the Duchy of Cornwall is integral to the royal finances for heirs, highlighting its importance in supporting the future king's public and private duties.