Pronunciation
Till, after cloying the gazettes with cant,
The age discovers he is not the true one;
Of such as these I should not care to vaunt,
I'll therefore take our ancient friend Don Juan
In the above passage, "Juan" is rhymed with "true one", the word being read according to the rules of English orthography as /ˈdʒuːən/ JEW-ən. A pattern of pronouncing foreign words according to the rules of English orthography recurs throughout the work.
Read more about this topic: Don Juan (Byron)