Battle of the Boyne (Orangemen's Day) 2027

Type of holiday: bank holiday, a non-working day.

The Battle of the Boyne, also known as Orangemen's Day or simply the Twelfth, is a bank holiday on 12 July in Northern Ireland alone. It commemorates the 1690 victory of William of Orange over James II at the River Boyne, north of Drogheda, a battle in the wider European conflict between William and Louis XIV that settled the Protestant succession in the three kingdoms.

The date carries an oddity worth knowing. The battle was fought on 1 July under the Julian calendar then in use in Britain and Ireland. When the Gregorian calendar was adopted in 1752 the accumulated difference pushed the anniversary forward, and commemoration eventually settled on 12 July — which also absorbed the anniversary of the Battle of Aughrim, fought a year later and once marked separately. So the holiday does not fall on the day the battle happened, and never did.

How it is observed

The Orange Order holds parades in towns and villages across Northern Ireland, with lodges marching behind banners to a field where speeches and a religious service are held, accompanied by flute, accordion and pipe bands. Bonfires are lit on the evening of the eleventh. The commemoration is contested — parade routes have been the subject of formal adjudication for decades — and this page states what happens rather than taking a view on it.

The July fortnight

The bank holiday is a single day, but Northern Irish working patterns treat it as the start of a longer break. Construction sites, engineering works and many manufacturers close for what is universally called the July fortnight, and a great deal of professional and administrative work slows with them. Anyone with a deadline running through mid-July in Belfast, Derry or Craigavon should assume responses will be slower than the bank holiday alone would suggest. The substitute day rule applies as elsewhere: 12 July on a Saturday or Sunday moves the day off to the following Monday.

In Great Britain, 12 July is an entirely ordinary working day — banks, courts and payment systems all operate. That makes this a regional holiday for counting purposes on this site: it is excluded from a Northern Irish working-day count, shown in the calendar, and left in a UK-wide total.