How did Edmund Mortimer become connected to the 1415 conspiracy?

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Henry V English king Henry V, painting by an unknown artist; in the National Portrait Gallery, London.

Edmund Mortimer, 5th earl of March, did not initiate the 1415 conspiracy; rather, he was the target of a plot orchestrated by others who sought to use his royal lineage to challenge Henry V.1

Because Mortimer was a great-grandson of Lionel, duke of Clarence, many considered him the legitimate heir to the throne over the Lancastrian line. In 1415, his brother-in-law, Richard, earl of Cambridge, and Henry, Lord Scrope of Masham, formed a conspiracy with the intent of deposing Henry V and placing Mortimer on the throne in his stead.1

Mortimer, who maintained persistent loyalty to the king, ultimately became connected to the event by exposing the plot to Henry V. Following his disclosure, the conspirators were dealt with, and Mortimer continued to serve the king faithfully in his French campaigns.1