In November 1204 Archbishop Adolph of Cologne and Duke Henry I of Brabant also switched to Philip's side in Koblenz. The Duke of Brabant received Maastricht and Duisburg and the Archbishop of Cologne was able to retain his position in the election and ordination of a King and was rewarded with 5,000 marks for sided with Philip. The growing money traffic in the High Middle Ages influenced the princes in their decisions for military support or in the question of their partisanship. With the transfer of the Archbishop of Cologne to his side, Philip's documentary production also increased considerably. However, the majority of Cologne's citizens remained on the Welf's side. The support commitments of Archbishop Adolph and Henry I of Brabant were the first one documented since the Hohenstaufen-Zähringen agreement from 1152. The double election is therefore also seen as a turning point, as it marked the beginning of written alliances in the northern Alpine empire. The number of contracts concluded also rose during the controversy for the throne. However, these written agreements were regularly broken for political reasons. The nobles tried to use the political situation to expand their regional principalities. Landgrave Hermann of Thuringia, Philip's cousin, changed sides five times between the outbreak of the controversy and the election of Frederick II in September 1211. According to historian Stefan Weinfurter, the relativization of the oath by the Pope was also essential for the breach of contract. Pope Innocent III advised the spiritual and secular princes to submit to his judgment only. With the Duke of Brabant, Philip strengthens ties in 1207 with the betrothal of his daughter Maria with Henry, heir of the Duchy of Brabant. As a result, Henry I should be closely tied to the Hohenstaufen monarchy.