DUCALVET, Pierre, French-Canadian political agitator, born in Canada about 1715; lost at sea in January 1786. By trading in fur he had acquired great wealth before the British conquered Canada, and remained in the country after that event. Being a Huguenot, he did not suffer from the disabilities resulting from the legal changes introduced into Canada after the peace of Versailles in 1763. His Roman Catholic compatriots, however, did so, and it was in his endeavors to relieve them of these grievances that Ducalvet came prominently into notice. In pursuance of this object he declared open war against the legislative council, and Sir Frederick Haldimand, the governor of Canada; demanded for the Canadians the same rights as British subject, s, and drew up a plan of a constitution, nearly the same as that which was granted in 1791. He also prosecuted Sir Frederick Haldimand in England, and the latter retaliated by procuring his imprisonment for treason. Ducalvet published in London a " Letter to the Canadians" and "Appeal to the Justice of the State," the latter addressed to the king and the Prince of Wales. He was lost at sea while on his way to England to continue the prosecution of Haldimand. Though he was in many respects a captious political agitator, his motives were undoubtedly pure, and he sacrificed his fortune in the cause of what he regarded as justice.