Definition of "participant"

Therefore during the parliament he published his royal proclamation, offering pardon and grace of restitution to all such as had taken arms, or been participant of any attempts against him;

1622, Francis, Lord Verulam, Viscount St. Alban [i.e. Francis Bacon], The Historie of the Raigne of King Henry the Seventh, […], London: […] W[illiam] Stansby for Matthew Lownes, and William Barret