I want to know the answer to the following question:
Who wrote an essay in 1945 that proposed a "new approach?"
All the background I'm provided with is that "Interpretations of Magna Carta and the role of the rebel barons in 1215 have been significantly revised: although the charter's symbolic, constitutional value for later generations is unquestionable, in the context of John's reign most historians now consider it a failed peace agreement between "partisan" factions.". Is that enough to answer the question?