The economic boom, driven by the demand for slaves and furs in the countries of the Middle East and Middle Asia, the Maghreb and al-Andalus, and the resultant silver fl ows coming into the peripheral zone of Europe, permitted or facilitated the formation of early centres of power. In Wielkopolska, fur from tributes and people captured during raiding expeditions were traded for ores and luxury goods. These, in turn, were used to pay for the retinue (družina). Therefore, prestige and silver constituted the basis of ‘central’ power, conditioned the support for the power and thus its continued reign. The Czech lands were an important link in the transcontinental trade connecting Khazaria and Hungary with al Andalus. The Přemyslids’ power relied heavily on the income arising from the control over the routes passing through Prague. Nevertheless, their reign, notably Boleslav I’s, was also founded upon the organisation of slave export, a factor driving and regulating the Bohemian political economy throughout the second half of the tenth century.