When, on 23 April 1661, Charles II's coronation put a King back on the throne, the counties of South West England were known as "the nursery of rebellion". Those counties – Devon, Dorset, Somerset and Cornwall – are approximately same area as Northern Ireland. I've re-jigged the map below to show the relative sizes.
"... The first to land were old Heywood Dare, Hugh Chamberlain, and Colonel Samuel Venner (see gravestone here). They indulged themselves in imprudent talk to fishermen, of there being a rebellion commenced in Ireland, and of another soon to come in England ...
The Duke of Monmouth, drest in purple, with a star on his breast and a sword at his side, was accompanied to shore by Lord Grey, Andrew Fletcher of Saltoun, Hooke the Duke's chaplain, Robert Ferguson who acted as the army chaplain, and other persons. The iniquitous and impolitic "Declaration" prepared by Ferguson was then read in the Lyme market-place. Rebellion had begun ..."
Here's an extract from another of the Roxburghe Ballads, a fictional, autobigraphical, song from the mouth of Monmouth himself.
Britain's Rights I am renewing,Can this give a just offence?Those that glory in my Ruine,I in time may recompence.For I'll have a stronger Army,and of Ammunition store:I'll have Drums & Trumpets charming,when as I come on Englands shore.My poor Souldiers they was takenand in Droves to Prison sent,This may protestants awaken,to behold Romes black intent:They shew not a grain of pity,which does grieve my heart full sore;For in every Town and Citythey were hang'd at their own door.There they ript their bellies open,and their bodies burnt hard by;Tell me, is not this a Tokenof the Acts of Cruelty?Nay, they cut them into quarterswhile they reekt in purple gore;Never was there such-like Creaturesin a Christian Land before.Tho' poor Souls their Lives were ended,yet, alas! this would not do,Malice further still extended,for they boil'd their Quarters too.All to terrifie the Nationwith my poor dead mangled men;While each tender dear Relationneeds must be afflicted then.
The saut sea shall be frozen, before that I repent;
Repent it shall I never, until the day I dee,
But the Lowlands of Holland hae twinn'd my Love and me!
Nearly a hundred local men, with some ex-rebels among them, declared that they were 'for the Duke of Monmouth', and challenged all comers to battle. Having beaten up their opponents and won the day, they did in great triumph hold up a bloody handkerchief declaring it to be Monmouth's colours'.
After singing 'songs concerning the Duke of Monmouth', the episode closed with the leader crying aloud 'now Holland (meaning ye said Riotters whereof he was one) had conquered France'. Monmouth was identified with Holland (and Protestantism and freedom); France with Popery and absolutism; and in the replay right had won.
The mock-battle shows how well villagers had understood the essence of 1685..."
• Source The Last Popular Rebellion; The Western Rising of 1685 by Robin Clifton (p276). A more detailed account is online here