im with the "influence only" supporters, however that doesn't stop me trying to draw parallels(besides its fun).
Ive always had Ned Stark down as Hastings, , loyal to his king, immediately beheaded on the ascension of the next king
Cersei is more Margaret of Anjou than Boleyn in my mind, desperate to cling on to power and secure the succession for her heirs.
Stark vs Lannister, (despite the obvious allusion in the name), which was a inter family feud that sparked a civil war reminds me of the Neville/Percy feud.
and throwing a few out there:
Littlefinger – Lord Rivers, minor noble who marries the widow of a great lord, readily swops sides
Stannis – Richard III, rightful king if his older brothers children were indeed illegitimate