 This lord of Annequin is also Count of Chaumont, Viscount of Fruges, Baron of Elnes, and Lord of Esquerdes.Converted to Calvinism, he takes part in the troubles that shake the Artois remained Catholic in the last third of the sixteenth century.He is one of the Protestant leaders who support the Prince of Orange against Spain (Catholic) who administers our region by inheritance from Charles V. In 1577, Eustache de Fiennes was even the leader of the Orange party in Saint - Omer, and in 1578 he participated in the Calvinist attempts to seize power in Arras.