Apart from Lord Howth, who had a connection by marriage to the new Tudor dynasty, almost all the nobility associated with the Brotherhood supported the claims of the Yorkist pretender Lambert Simnel, and some of them followed him to his crushing defeat by Henry VII at the Battle of Stoke in 1487.
Simnel's army — mainly Flemish and Irish troops — landed on Piel Island in the Furness area of Lancashire on 5 June 1487 and were joined by some English supporters.
It could also be a misspelling of "Simnel", for which see Lambert Simnel.
It was here that the coronation of the boy impostor, Lambert Simnel, took place in 1487.
A few years later, in 1487, the crown that had been used by the pretender Lambert Simnel was given to a statue of the Virgin in Dublin.
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After the downfall of the House of York, Gormanston, like most of the Anglo-Irish nobility, supported the pretender to the Crown, Lambert Simnel, but was pardoned in 1488 and restored to favour.