The way that Otto I gained support from many church bishops is; By using the power of lay investiture.
Lay Investiture is defined as the system or process whereby the religious leaders are elected and given appointment by the rulers or monarchs of secular states or kingdoms.
Otto I was the ruler of Germany and the Roman empire after the death of his father Henry I. Thus, he took responsibility for installation of the leadership of the local church.
Due to the fact that the installation was supposed to be the rights and duty of the church in appointing the local leaders, Otto's act led to an increase in his loyal followers and this practice of investiture gained a large number of support from many Bishops.
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