Documents, [c.1590xc.1600]-[c.1642x1648], accumulated by Edward Herbert during the course of his career as Member of Parliament for Montgomery, and during his studies into English politics; many are copies made by him or for him. They include accounts of parliamentary business and history, and of individual political figures; treatises by Herbert on particular aspects of governance and political authority, notably the relationship between king, parliament and the subject; accounts of the origins and course of the civil war; and instruments relating to the government of Montgomeryshire and the Welsh marches.