What did a duke do in midevel times?

Answer 1

Historically and in the present day, dukes owned large estates and were entrusted with the upkeep of the lands, regulating local taxes, dealing the rent of their tenants, etc. and had considerable political influence.

However, in the present day, a duke will only hold political influence if they have a seat in some form of parliament, such as the House of Lords. Though many still hold estates, their business is mainly that of financially supporting touristy endeavors, though many are just with the title and no lands.

Answer 2

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