The development of Anglo-Saxon kingship is little understood, but the model proposed by York considered the development of kingdoms and writing down of the oral law-codes to be linked to a progression towards leaders providing mund and receiving recognition. These leaders who developed in the sixth century were able to seize the initiative and to establish a position of power for themselves and their successors. Anglo-Saxon leaders, unable to tax and coerce followers, extracted surplus by raiding and collecting food renders and 'prestige goods'. The later sixth century saw the end of a 'prestige goods' economy, as evidenced by the decline of accompanied burial, and the appearance of the first princely graves and high-status settlements. These centres of trade and production reflect the increased socio-political stratification and wider territorial authority which allowed seventh-century elites to extract and redistribute surpluses with far greater effectiveness than their sixth-century predecessors would have found possible. Anglo-Saxon society, in short, looked very different in 600 than it did a hundred years earlier.