The speech of Macmorris in Henry V displays a few hints of an Irish pronunciation, with its replacement of /s/ by /sh/, changes in vowel quality, and the loss of a final consonant.

Irish pronunciation English word First use in Henry V
be by H5 III.ii.106
beseeched besieged H5 III.ii.115
Chrish Christ H5 III.ii.85
ish is H5 III.ii.85
sa’ save H5 III.ii.109
’tish ’tis H5 III.ii.85
trompet trumpet H5 III.ii.86

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