This writing explained about the social, economic, and political background around the local leaders which happened when there was political power change in harbors of Java north seashores throughout the 15th century. This explanation could make clear about the process of Islamic settle through the politic power shift from Hindu-Budha to Muslim leaders in Java north seashores to be something which was plausible. The above description has ignored the social, economic, and political contexts in the societies, where the king lives and leads. This description also assumed that it was not important about the marriage relationship among Muslim sellers with princesses and between infidel leaders with Muslim leaders’ daughter in other places. A special discussion should be made to make the religious and political change to be more made sense. The way was by looking at the religious change of the area leaders as the last process of Islamic political era. The roles of imam-mollah enabled them to have practical politic activity and have high position in the activity that was as king’s adviser. The role of imam-mollah as king’s adviser was seen as the arousing of big position and role of the Brahmin and social politic system of Hindu-Budha in Indonesia. The roles of imam-mollah in the golden era of Java north seashore compared with the Brahmin also needed special review. At the beginning of Muslim sellers came to Indonesia had relationship between the activities of trade, politic, and religion. The Muslim sellers had mutualism and volunteer trade relationship with the infidel leaders in north seashores. But, day by day, if a trade center got crowded and wealth, and the community and leaders there were Muslims, the surrounded leaders who want to have relationship with Muslim sellers in the trade center seemed to have psychology push to be Muslim.