[5] The background of the regulation was that Bavarian bishops, abbots and counts, "whose path led them to eastern territories" (qui in orientales partes iter habebant), had complained (clamor) to the child-king about being "disturbed by unauthorised customs duties and tolls" (se iniusto theloneo et iniqua muta constrictos in illis partibus et coartatos).
[5] Therefore, a royal order was issued to the Margrave of the Bavarian Ostmark Aribo (r. 871–909), together with "judges from the eastern territories" (iudicibus orientalium), to investigate and redefine the existing, traditional customs law.
[5] Then, a total of 41 named secular and church officials including bishops and counts reviewed the investigation, and the Inquisitio de theloneis Raffelstettensis summarises the results of their findings.
[5] "Ships from the western regions, however, which have left the Passau Forest and want to land at Rosdorf or wherever and hold market, pay half a drachma as duty, that is one scoti.
[citation needed] As the 41 officials claimed to list the customs places and rates that were supposedly in force during the reigns of Louis the German (r. 843–876) and Carloman of Bavaria (r. 876–879), some inferences can be made about the period between the 840s and 906, although extrapolating beyond 906 is much riskier.