When first Adan was called?

The first call to prayer, known as the Adhan, was established by the Prophet Muhammad in Medina around 622 CE, shortly after the migration from Mecca. Bilal ibn Rabah, a close companion of the Prophet, was chosen as the first muezzin to deliver the Adhan. This practice was instituted to gather the Muslim community for prayer and has since become a fundamental aspect of Islamic worship.