It's the commemoration of the Battle of the Boyne.
A TD's been labelled 'naive' for suggesting July 12th becomes a public holiday south of the border.
Green Party TD Patrick Costello believes it should be legislated for here, to demonstrate a shared sense of ownership and history of the island.
In the North the date commemorates the Battle of the Boyne with bonfires and parades.
Aontú Leader Peadar Tóibín says it shouldn't be a holiday in the Republic:
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