This paper considers Portuguese invasion as a major political shock in the history of Hormuz Island in the 10th century. Looking upon the aftermath of the event, the body of the article focuses on the influence of political history and the formation of public resistance in Hormuz. Hormuz’ political history was not confined to the island; rather it encompassed regions in the North and South of Persian Gulf. The fact provides a firm ground to evaluate the identity of Persian Gulf with an special emphasis on its Iranian nature. For a long time, the nobility of Hormuz were the biggest centre of power in the waters around. They also functioned as strong barriers on the way of foreign invasions. As a result of business and trade they made a huge amount of wealth that brought about economic development. Therefore, they were the main dominant Iranian force in the seas around. However, the decline of Hormuz brought abount different consequences of which we can name the initiation of the age of colonialism in the region. The latter fact constitutes the main axis for the present article.