What is the difference between An Irish and an English peerage?

The Duke of Wellingtons brother was given an Irish peerage but really wanted an English peerage. Why would this be? Was an Irish peerage of lesser imp

The Duke of Wellington's brother was given an Irish peerage but really wanted an English peerage. Why would this be? Was an Irish peerage of lesser importance than an English one?

or:The Duke of Wellington's brother was given an Irish peerage but really wanted an English peerage. Why would this be? Was an Irish peerage of lesser importance than an English one?

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