"[O]nce...the early seventeenth century is treated as a sequence of events rather than the working out of a destiny – the parliamentary history of 1603–28 ceases to be the record of the "inevitable" accentuation of inherent strain and becomes comprehensible as a series of political crises, complicated by personality, in which the outcome may be identified but cannot be presumed from the start. In the context it is worth notice that James I's last Parliament was the only one in which Crown and Commons worked in a measure of harmony, and that even in 1628 the opposition leadership carefully avoided any proposals which could be read as an invasion of prerogative rights. The ineffectiveness of the Petition of Right, as futile a document as even constitutional struggles have ever thrown up, neatly demonstrates the absence of revolutionary strains in the difficulties encountered up to that point. Before Charles I's experiment in the 1630s, war was not so much inevitable as totally improbable; and the failure of Charles's government was not rendered "inevitable" by deep divisions in society or inherited stresses in the constitution, but was conditioned by the inability of the king and his ministers to operate any political system."