His followers will eventually be known as Sikhs, and the word Sikh comes from the Sanskrit word for to learn or learning, and it's related to the word for student. And even in modern Sanskrit-derived languages like Hindi, you have words like Sikhna, which means to learn. Guru Nanak dies in the early 16th century, and you can see by this point, the Mughals have taken control of northern India. And before his death, he names Guru Angad, who is not his son, as his successor. After Guru Angad, you have Guru Amardas, and then you have Guru Ramdas, who establishes the city now sacred to Sikhs known as Amritsar, originally known as Ramdaspur. Guru Ramdas is succeeded on his death by Guru Arjan, and Guru Arjan is significant for many reasons. He creates the compilation known as the Adi Granth, which are the sayings and the hymns of the previous gurus, including his own.