Henry Blayney, 2nd Baron Blayney

Rt. Hon. Henry Blayney, 2nd Baron Blayney, Baron of Monaghan (d. 5th June 1646 at the Battle of Benburb) was the son of Edward Blayney, 1st Baron, and of Ann his wife, daughter of Adam Loftus, Archbishop of Dublin, and sometime Lord Chancellor of Ireland, which Edward Lord Blayney was son of John Blayney of Tregonog in Montgomeryshire.

Henry Blayney witnessed the outbreak of the Irish Rebellion of 1641; "who, at the surprisal of his house at Castle Blayney by the Irish rebels on the 23rd of October, 1641, brought the news of that outbreak to Dublin. During the rebellion he kept the little fort of Monaghan with the 97th Foot until the fatal Battle of Benburb, in the County of Tyrone, in which he lost his life at the head of his men, fighting against O'Neill, 5th of June, 1646, and was buried at Monaghan."

In 1643 Lord Blayney swore in a legal deposition: ..that he lost his castle at Blayney in County Monaghan, together with goods and riding horses worth £237, plate (£500), linen (£500), and beasts, cattle and sheep (£925). There was ‘More howsholdstuff in his 2 howses worth at least 1000 markes, ready money £296, due debts £400, a library of bookes worth £500’, besides other things that he could not recall. In all, Blayney estimated that the insurgents had inflicted £13,873–8–4 worth of damage on his property, goods and livestock, and that he had lost an annual rental of £2,250.