This is the 3878th most frequent Portuguese word.
duque
"Duke" (a noble title).
Here, 'duque' refers to a hereditary title of nobility, indicating a high rank in the hierarchical system of certain monarchies.
O duque é um título de nobreza usado em diversas monarquias.
The duke is a title of nobility used in various monarchies.
In this case, 'Duque' is capitalized and used as a proper noun, denoting a specific person's title.
Ele é agora conhecido como Duque de São Paulo.
He is now known as the Duke of São Paulo.
The word 'duque' here is used colloquially to refer to the result of rolling the dice and getting two ones, akin to the term 'snake eyes'.