Davout inherited the title Duke of Auerstaedt upon his father's death in 1823.

As head of the house, he uses the title Duke of Castro.

He used the title Duke of Madrid as his grandfather had done.

In 1876, the title Duke of Gordon was created.

It is closely associated with the title Duke of Rothesay.

Should he die without a male heir, the title Duke of Bourbon would go to a distant relative.

His one year old son Thomas succeeded to the title Duke of Genoa.

Przemko nevertheless continued to use the title Duke of Opava.

The title Duke of Lancaster became extinct upon her father's death without male heirs in 1361.

He was rewarded for his abilities in the campaign with the title Duke of Tetuan.