Despite the failure of the Anglo-Scottish union negotiations in 1607, the early Stuart monarchs encouraged various civil policies aimed at fostering cooperation and unity among their three kingdoms. However, the opposition they faced from leading subjects frequently forced them to limit or retreat from British ventures. In arguing that the early Stuarts maintained a consistent yet uncomplicated policy of encouraging cooperation among their subjects, this work offers a new perspective on the role of multiple monarchy in the early modern British kingdoms. It has been generally accepted that James VI (James I of Britain) abandoned most efforts aimed at British unity following the failed Anglo-Scottish union negotiations of 1604-1607. This study asserts that James’ desire for British unity and inter-kingdom cooperation should not be assessed within the context of that aborted political effort, but, instead, should be analyzed as a long-term project. Union designs predated his ascension to the English throne by some 20 years and continued up to his death in 1625. James was mindful of the possibilities for cooperation which were inherent in inter-kingdom defence policies, trade practices, colonial projects and foreign policy. Many of the assumptions that caused James to project encompassing policies were continued by Charles I, an unstudied element of British continuity between the two reigns. Ultimately, failure to emphasize the need for British unity in relation to a variety of civil policies would be an important factor in the fall of the Stuart monarchy during the British civil wars of the 1640s.