asserter meaning in French

n. défenseur; partisan; champion

30 Nov 1751) Hon. John Finch Lady Frances Finch (d. c. 21 Mar 1759) Lady Elizabeth Finch (c. 1679 – 26 Feb 1757) According to John Macky (Memoirs, pp. 71; published by Roxburghe Club, 1895) he was accounted one of the greatest orators in England and a good common lawyer; a firm asserter of the prerogative of the crown and jurisdiction of the church; a tall, thin man.
John Finch Lady Frances Finch (d.21 mars 1759) Lady Elizabeth Finch ({1679 - 26 février 1757) Selon Jean Macky (Mémoires, pp. 71; publié par Roxburghe Club, 1895), il a été l'un des plus grands orateurs en Angleterre et un bon avocat.