There are three types of Buddhism. Teravada,Mahayana and Vajrayana. He propagated Mahayana Buddhism. I speculate he was a student in Nalanda University and later became a teacher. He then set out to propagate Mahayana Buddhism and education in south India, Andhra Pradesh.
You see. .the Amaravati institute/university that was built under his supervision was one of the leading universities in the world. Students from Japan, Indonesia and china would join this university in first century AD for their higher studies. The education included a syllabus of maths,astrology, medicine and various other skills. Propagating Buddhism was the basic agenda all along.
To pay a tribute to such a phenomenal scholar and historical figure, the university was named after him.
The stronger a light shines the darker are the shadows around it.
Beware! I question everything and everybody.
Nagarjuna appears as a reformer, primarily as a Buddhist reformer to be sure.