Lambert Simnel was a random poor kid adopted by an elite Yorkist and relabelled as heir to the throne of England (recently occupied by Henry VII) - actually a puppet for powerful interest groups.
First Simnel was going to be passed off as the Duke of York, but he was eventually claimed to be the Earl of Warwick, and a rebellion was begun by raising an army in Ireland and having him 'crowned' King Edward VI.
The rebels invaded England but were defeated - and the child Simnel was pardoned and allowed to live as a servant in the King's household.
It used to seem strange that a random kid was pulled from obscurity by the elites and claimed to be someone he was not; but of course, now it happens all the time.
I was peripherally involved in fighting an example of the Lambert Simnel Strategy in 2000 when an upper middle class girl called Laura Spence (her father was a headmaster which puts her in socal class 1) was plucked from Obscurity by Gordon Brown (then Chancellor, later Prime Minister) who claimed she represented the poor from the North and State Schools who were being excluded from Oxford on snobbish grounds.
The UK government then used this faked-up injustice to take-over control of university admissions, a process which is now almost complete.
Herschel Grynszpan was another kid, but he shot and killed a German diplomat as a protest against the Nazi expulsion of the Jews, which act was used to rationalize the Kristallnacht.
From an analytic perspective, the Herschel Grynszpan strategy shows who really is suppressing whom in a society, who is really dominant.
Who is really being persecuted, and who is doing the persecuting.
The people who used Simnel and Grynspan knew exactly what they were doing: they were deliberately setting out to deceive people; and they succeeded in deceiving many people.
They caused a great deal of suffering and death.
The Lambert Simnel strategy is almost the opposite of the Herschel Grynszpan Strategy - in the first an obscure person is put forward as representative of the Good, and used to justify a revolutionary takeover; in the second an obscure person is put forward as representative of the Evils of a whole group, and used to justify a revolutionary takeover.
Both Lambert Simnel and Herschel Grynszpan were manufactured excuses for elite to do what they wanted to do, excuses to implement a predesigned plan.
As excuses, Simnel was completely faked, Grynszpan was semi-real.
But there has been considerable 'moral progress' and much greater public dissemination of communications since 1938: nowadays, both would be faked.
Other variants could be added at will: for example the Horst Wessel Strategy, whereby somebody who has been killed (or, nowadays, subjected to hurt feelings) is fabricated into a saint and martyr for the cause; and their death (or unhappiness) a sweeping condemnation of the those who are asserted to be associated-with the killing (or hurtful comment).
The who-whom of a successful Horst Wessel strategy is evidence of the reality of societal power relations.