Their kingdom was regulated by a complex patchwork combining a typically western European feudal framework with Celtic custom, which can be traced in many of its details to Irish law tracts of the seventh or eighth century. The result was what has been called a 'hybrid kingdom', and one of its marks was the emergence of composite common law of Scotland by the twelfth century. The conjunction of old and new marked every aspect of life in twelfth-century Scotland. The king's army was a mixture of feudal knights, products of typical western European system of knight service, and a 'common army' of infantry and bowmen, which had for centuries acknowledged, 'forinsec' or 'Scottish service' to the king. At Bannockburn in 1314 they still comprised the bulk of Robert I's army. The king's revenue was raised through a combination of the new land assessments of feudal tenure - knights' fee and the older obligations such cain. The difficulty lies in terminology, for phrases such a 'Scottish service' or 'the custom in that country' (in this case Argyll) were the invention of the king's clerks. The older, established nexus of law, custom and kingship had no convenient name - nor has to this day. Yet by 1100 Gaelic law and custom had reached almost every part of what we now know as Scotland, including Lothian in the southeast. The new feudalism of twelfth century came into contact not with a receding Celtic culture but with a still expanding one.