Ransom of an English Nobleman

At page 28. vol. ii. of the *Secret History of the Court of James I.*, Edinburgh, 1811 (a reprint), occurs the following:— "Nay, to how lowe an ebbe of honor was this our poore despicable kingdome brought, that (even in Queen Elizabeth's time, the glory of the world) a great nobleman being taken prisoner, was freely released with this farewell given him, that they desired but two mastieffes for his ransome!" Who was this great nobleman, and where may I find the fullest particulars of the whole transaction?