I'm mostly familiar with the later Tudor period, so H8 and his amazing array of wives tend to confuse me.
Boleyn was related to the Ormond Butlers, and I do understand the basics. But I have not come across a full account of that relationship and its political implications.
English historians tend to treat Irish matters with arched eyebrow - "ouch, that's impenetrable, and anyway it's a matter for the Irish" - but even the Irish accounts, including the Butler archives, don't do the relationship justice.
The pivotal character is the 9th earl of Ormond:
Anyone have insight?